diff --git a/chrome/browser/chromeos/extensions/file_manager/private_api_mount.cc b/chrome/browser/chromeos/extensions/file_manager/private_api_mount.cc
index 3591fab967e7a..15a0ecd718c7f 100644
--- a/chrome/browser/chromeos/extensions/file_manager/private_api_mount.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/private_api_mount.cc
@@ -193,7 +193,7 @@ void FileManagerPrivateAddMountFunction::RunAfterMarkCacheFileAsMounted(
   disk_mount_manager->MountPath(
       file_path.AsUTF8Unsafe(),
       base::FilePath(display_name.Extension()).AsUTF8Unsafe(),
-      display_name.AsUTF8Unsafe(), chromeos::MOUNT_TYPE_ARCHIVE,
+      display_name.AsUTF8Unsafe(), {}, chromeos::MOUNT_TYPE_ARCHIVE,
       chromeos::MOUNT_ACCESS_MODE_READ_WRITE);
 }
 
diff --git a/chrome/browser/chromeos/file_manager/fake_disk_mount_manager.cc b/chrome/browser/chromeos/file_manager/fake_disk_mount_manager.cc
index 4f78bda1e9367..0e4c7b6748936 100644
--- a/chrome/browser/chromeos/file_manager/fake_disk_mount_manager.cc
+++ b/chrome/browser/chromeos/file_manager/fake_disk_mount_manager.cc
@@ -10,17 +10,21 @@ FakeDiskMountManager::MountRequest::MountRequest(
     const std::string& source_path,
     const std::string& source_format,
     const std::string& mount_label,
+    const std::vector<std::string>& mount_options,
     chromeos::MountType type,
     chromeos::MountAccessMode access_mode)
     : source_path(source_path),
       source_format(source_format),
       mount_label(mount_label),
+      mount_options(mount_options),
       type(type),
       access_mode(access_mode) {}
 
 FakeDiskMountManager::MountRequest::MountRequest(const MountRequest& other) =
     default;
 
+FakeDiskMountManager::MountRequest::~MountRequest() = default;
+
 FakeDiskMountManager::UnmountRequest::UnmountRequest(
     const std::string& mount_path,
     chromeos::UnmountOptions options)
@@ -69,13 +73,15 @@ void FakeDiskMountManager::EnsureMountInfoRefreshed(
   callback.Run(true);
 }
 
-void FakeDiskMountManager::MountPath(const std::string& source_path,
-                                     const std::string& source_format,
-                                     const std::string& mount_label,
-                                     chromeos::MountType type,
-                                     chromeos::MountAccessMode access_mode) {
-  mount_requests_.emplace_back(source_path, source_format, mount_label, type,
-                               access_mode);
+void FakeDiskMountManager::MountPath(
+    const std::string& source_path,
+    const std::string& source_format,
+    const std::string& mount_label,
+    const std::vector<std::string>& mount_options,
+    chromeos::MountType type,
+    chromeos::MountAccessMode access_mode) {
+  mount_requests_.emplace_back(source_path, source_format, mount_label,
+                               mount_options, type, access_mode);
 
   const MountPointInfo mount_point(
       source_path,
diff --git a/chrome/browser/chromeos/file_manager/fake_disk_mount_manager.h b/chrome/browser/chromeos/file_manager/fake_disk_mount_manager.h
index de9e77df5cdd1..892a94b6a90fb 100644
--- a/chrome/browser/chromeos/file_manager/fake_disk_mount_manager.h
+++ b/chrome/browser/chromeos/file_manager/fake_disk_mount_manager.h
@@ -24,13 +24,16 @@ class FakeDiskMountManager : public chromeos::disks::DiskMountManager {
     MountRequest(const std::string& source_path,
                  const std::string& source_format,
                  const std::string& mount_label,
+                 const std::vector<std::string>& mount_options,
                  chromeos::MountType type,
                  chromeos::MountAccessMode access_mode);
     MountRequest(const MountRequest& other);
+    ~MountRequest();
 
     std::string source_path;
     std::string source_format;
     std::string mount_label;
+    std::vector<std::string> mount_options;
     chromeos::MountType type;
     chromeos::MountAccessMode access_mode;
   };
@@ -44,7 +47,7 @@ class FakeDiskMountManager : public chromeos::disks::DiskMountManager {
   };
 
   struct RemountAllRequest {
-    RemountAllRequest(chromeos::MountAccessMode access_mode);
+    explicit RemountAllRequest(chromeos::MountAccessMode access_mode);
     chromeos::MountAccessMode access_mode;
   };
 
@@ -79,6 +82,7 @@ class FakeDiskMountManager : public chromeos::disks::DiskMountManager {
   void MountPath(const std::string& source_path,
                  const std::string& source_format,
                  const std::string& mount_label,
+                 const std::vector<std::string>& mount_options,
                  chromeos::MountType type,
                  chromeos::MountAccessMode access_mode) override;
   // In order to simulate asynchronous invocation of callbacks after unmount
diff --git a/chrome/browser/chromeos/file_manager/volume_manager.cc b/chrome/browser/chromeos/file_manager/volume_manager.cc
index 2a4739b27b44b..63d190a7acae9 100644
--- a/chrome/browser/chromeos/file_manager/volume_manager.cc
+++ b/chrome/browser/chromeos/file_manager/volume_manager.cc
@@ -560,7 +560,8 @@ void VolumeManager::OnAutoMountableDiskEvent(
         // format if the second argument is empty. The third argument (mount
         // label) is not used in a disk mount operation.
         disk_mount_manager_->MountPath(disk.device_path(), std::string(),
-                                       mount_label, chromeos::MOUNT_TYPE_DEVICE,
+                                       mount_label, {},
+                                       chromeos::MOUNT_TYPE_DEVICE,
                                        GetExternalStorageAccessMode(profile_));
         mounting = true;
       }
@@ -677,7 +678,7 @@ void VolumeManager::OnFormatEvent(
         // empty. The third argument (mount label) is not used in a disk mount
         // operation.
         disk_mount_manager_->MountPath(device_path, std::string(),
-                                       std::string(),
+                                       std::string(), {},
                                        chromeos::MOUNT_TYPE_DEVICE,
                                        GetExternalStorageAccessMode(profile_));
       }
@@ -723,7 +724,7 @@ void VolumeManager::OnRenameEvent(
       // disk when it was first time mounted (to preserve mount point regardless
       // of the volume name).
       disk_mount_manager_->MountPath(device_path, std::string(), mount_label,
-                                     chromeos::MOUNT_TYPE_DEVICE,
+                                     {}, chromeos::MOUNT_TYPE_DEVICE,
                                      GetExternalStorageAccessMode(profile_));
 
       bool successfully_renamed = error_code == chromeos::RENAME_ERROR_NONE;
diff --git a/chrome/browser/chromeos/file_manager/volume_manager_unittest.cc b/chrome/browser/chromeos/file_manager/volume_manager_unittest.cc
index 117b3bf09dce9..b3d0006a91980 100644
--- a/chrome/browser/chromeos/file_manager/volume_manager_unittest.cc
+++ b/chrome/browser/chromeos/file_manager/volume_manager_unittest.cc
@@ -594,7 +594,8 @@ TEST_F(VolumeManagerTest, OnMountEvent_Remounting) {
           chromeos::DEVICE_TYPE_UNKNOWN, 0, false, false, false, false, false,
           false, "", ""));
   disk_mount_manager_->AddDiskForTest(std::move(disk));
-  disk_mount_manager_->MountPath("device1", "", "", chromeos::MOUNT_TYPE_DEVICE,
+  disk_mount_manager_->MountPath("device1", "", "", {},
+                                 chromeos::MOUNT_TYPE_DEVICE,
                                  chromeos::MOUNT_ACCESS_MODE_READ_WRITE);
 
   const chromeos::disks::DiskMountManager::MountPointInfo kMountPoint(
@@ -745,9 +746,11 @@ TEST_F(VolumeManagerTest, OnFormatEvent_CompletedFailed) {
 
 TEST_F(VolumeManagerTest, OnExternalStorageDisabledChanged) {
   // Here create two mount points.
-  disk_mount_manager_->MountPath("mount1", "", "", chromeos::MOUNT_TYPE_DEVICE,
+  disk_mount_manager_->MountPath("mount1", "", "", {},
+                                 chromeos::MOUNT_TYPE_DEVICE,
                                  chromeos::MOUNT_ACCESS_MODE_READ_WRITE);
-  disk_mount_manager_->MountPath("mount2", "", "", chromeos::MOUNT_TYPE_DEVICE,
+  disk_mount_manager_->MountPath("mount2", "", "", {},
+                                 chromeos::MOUNT_TYPE_DEVICE,
                                  chromeos::MOUNT_ACCESS_MODE_READ_ONLY);
 
   // Initially, there are two mount points.
diff --git a/chrome/browser/chromeos/login/kiosk_browsertest.cc b/chrome/browser/chromeos/login/kiosk_browsertest.cc
index f7cc1a3ce7fe4..1017a86f90779 100644
--- a/chrome/browser/chromeos/login/kiosk_browsertest.cc
+++ b/chrome/browser/chromeos/login/kiosk_browsertest.cc
@@ -369,7 +369,7 @@ class KioskFakeDiskMountManager : public file_manager::FakeDiskMountManager {
 
   void MountUsbStick() {
     DCHECK(!usb_mount_path_.empty());
-    MountPath(usb_mount_path_, "", "", chromeos::MOUNT_TYPE_DEVICE,
+    MountPath(usb_mount_path_, "", "", {}, chromeos::MOUNT_TYPE_DEVICE,
               chromeos::MOUNT_ACCESS_MODE_READ_ONLY);
   }
 
diff --git a/chromeos/components/drivefs/drivefs_host.cc b/chromeos/components/drivefs/drivefs_host.cc
index 28ec470e87eec..9269bc8e74fed 100644
--- a/chromeos/components/drivefs/drivefs_host.cc
+++ b/chromeos/components/drivefs/drivefs_host.cc
@@ -88,7 +88,7 @@ class DriveFsHost::MountState : public mojom::DriveFsDelegate,
     // TODO(sammc): Switch the mount type once a more appropriate mount type
     // exists.
     chromeos::disks::DiskMountManager::GetInstance()->MountPath(
-        source_path_, "", "", chromeos::MOUNT_TYPE_ARCHIVE,
+        source_path_, "", "", {}, chromeos::MOUNT_TYPE_ARCHIVE,
         chromeos::MOUNT_ACCESS_MODE_READ_WRITE);
 
     auto bootstrap =
diff --git a/chromeos/components/drivefs/drivefs_host_unittest.cc b/chromeos/components/drivefs/drivefs_host_unittest.cc
index 51b6e8f9470b4..31d3b2d9caae9 100644
--- a/chromeos/components/drivefs/drivefs_host_unittest.cc
+++ b/chromeos/components/drivefs/drivefs_host_unittest.cc
@@ -252,7 +252,7 @@ class DriveFsHostTest : public ::testing::Test,
         MountPath(testing::AllOf(
                       testing::StartsWith("drivefs://"),
                       testing::EndsWith("@/path/to/profile/GCache/v2/g-ID")),
-                  "", "", _, chromeos::MOUNT_ACCESS_MODE_READ_WRITE))
+                  "", "", _, _, chromeos::MOUNT_ACCESS_MODE_READ_WRITE))
         .WillOnce(testing::SaveArg<0>(&source));
 
     mojom::DriveFsBootstrapPtrInfo bootstrap;
@@ -445,7 +445,7 @@ TEST_F(DriveFsHostTest, MountWhileAlreadyMounted) {
 }
 
 TEST_F(DriveFsHostTest, UnsupportedAccountTypes) {
-  EXPECT_CALL(*disk_manager_, MountPath(_, _, _, _, _)).Times(0);
+  EXPECT_CALL(*disk_manager_, MountPath(_, _, _, _, _, _)).Times(0);
   const AccountId unsupported_accounts[] = {
       AccountId::FromGaiaId("ID"),
       AccountId::FromUserEmail("test2@example.com"),
diff --git a/chromeos/dbus/cros_disks_client.cc b/chromeos/dbus/cros_disks_client.cc
index 3b7d4ad267c34..81f7958272e33 100644
--- a/chromeos/dbus/cros_disks_client.cc
+++ b/chromeos/dbus/cros_disks_client.cc
@@ -112,6 +112,7 @@ class CrosDisksClientImpl : public CrosDisksClient {
   void Mount(const std::string& source_path,
              const std::string& source_format,
              const std::string& mount_label,
+             const std::vector<std::string>& mount_options,
              MountAccessMode access_mode,
              RemountOption remount,
              VoidDBusMethodCallback callback) override {
@@ -120,9 +121,9 @@ class CrosDisksClientImpl : public CrosDisksClient {
     dbus::MessageWriter writer(&method_call);
     writer.AppendString(source_path);
     writer.AppendString(source_format);
-    std::vector<std::string> mount_options =
-        ComposeMountOptions(mount_label, access_mode, remount);
-    writer.AppendArrayOfStrings(mount_options);
+    std::vector<std::string> options =
+        ComposeMountOptions(mount_options, mount_label, access_mode, remount);
+    writer.AppendArrayOfStrings(options);
     proxy_->CallMethod(
         &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
         base::BindOnce(&CrosDisksClientImpl::OnVoidMethod,
@@ -674,12 +675,13 @@ base::FilePath CrosDisksClient::GetRemovableDiskMountPoint() {
 
 // static
 std::vector<std::string> CrosDisksClient::ComposeMountOptions(
+    const std::vector<std::string>& options,
     const std::string& mount_label,
     MountAccessMode access_mode,
     RemountOption remount) {
-  std::vector<std::string> mount_options(
-      kDefaultMountOptions,
-      kDefaultMountOptions + arraysize(kDefaultMountOptions));
+  std::vector<std::string> mount_options = options;
+  mount_options.insert(mount_options.end(), kDefaultMountOptions,
+                       kDefaultMountOptions + base::size(kDefaultMountOptions));
   switch (access_mode) {
     case MOUNT_ACCESS_MODE_READ_ONLY:
       mount_options.push_back(kReadOnlyOption);
@@ -697,6 +699,7 @@ std::vector<std::string> CrosDisksClient::ComposeMountOptions(
         base::StringPrintf("%s=%s", kMountLabelOption, mount_label.c_str());
     mount_options.push_back(mount_label_option);
   }
+
   return mount_options;
 }
 
diff --git a/chromeos/dbus/cros_disks_client.h b/chromeos/dbus/cros_disks_client.h
index 96308d96b9d2f..1dcec5284544b 100644
--- a/chromeos/dbus/cros_disks_client.h
+++ b/chromeos/dbus/cros_disks_client.h
@@ -322,6 +322,7 @@ class CHROMEOS_EXPORT CrosDisksClient : public DBusClient {
   virtual void Mount(const std::string& source_path,
                      const std::string& source_format,
                      const std::string& mount_label,
+                     const std::vector<std::string>& mount_options,
                      MountAccessMode access_mode,
                      RemountOption remount,
                      VoidDBusMethodCallback callback) = 0;
@@ -379,6 +380,7 @@ class CHROMEOS_EXPORT CrosDisksClient : public DBusClient {
 
   // Composes a list of mount options.
   static std::vector<std::string> ComposeMountOptions(
+      const std::vector<std::string>& options,
       const std::string& mount_label,
       MountAccessMode access_mode,
       RemountOption remount);
diff --git a/chromeos/dbus/cros_disks_client_unittest.cc b/chromeos/dbus/cros_disks_client_unittest.cc
index 11c18e04fa9c0..c4ae26cb7766f 100644
--- a/chromeos/dbus/cros_disks_client_unittest.cc
+++ b/chromeos/dbus/cros_disks_client_unittest.cc
@@ -163,7 +163,7 @@ TEST(CrosDisksClientTest, ComposeMountOptions) {
   std::string kExpectedMountLabelOption =
       std::string("mountlabel=") + kMountLabel;
   std::vector<std::string> rw_mount_options =
-      CrosDisksClient::ComposeMountOptions(kMountLabel,
+      CrosDisksClient::ComposeMountOptions({}, kMountLabel,
                                            MOUNT_ACCESS_MODE_READ_WRITE,
                                            REMOUNT_OPTION_MOUNT_NEW_DEVICE);
   ASSERT_EQ(5U, rw_mount_options.size());
@@ -174,7 +174,7 @@ TEST(CrosDisksClientTest, ComposeMountOptions) {
   EXPECT_EQ(kExpectedMountLabelOption, rw_mount_options[4]);
 
   std::vector<std::string> ro_mount_options =
-      CrosDisksClient::ComposeMountOptions(kMountLabel,
+      CrosDisksClient::ComposeMountOptions({}, kMountLabel,
                                            MOUNT_ACCESS_MODE_READ_ONLY,
                                            REMOUNT_OPTION_MOUNT_NEW_DEVICE);
   ASSERT_EQ(5U, ro_mount_options.size());
@@ -186,7 +186,7 @@ TEST(CrosDisksClientTest, ComposeMountOptions) {
 
   std::vector<std::string> remount_mount_options =
       CrosDisksClient::ComposeMountOptions(
-          kMountLabel, MOUNT_ACCESS_MODE_READ_WRITE,
+          {}, kMountLabel, MOUNT_ACCESS_MODE_READ_WRITE,
           REMOUNT_OPTION_REMOUNT_EXISTING_DEVICE);
   ASSERT_EQ(6U, remount_mount_options.size());
   EXPECT_EQ("nodev", remount_mount_options[0]);
@@ -195,6 +195,19 @@ TEST(CrosDisksClientTest, ComposeMountOptions) {
   EXPECT_EQ("rw", remount_mount_options[3]);
   EXPECT_EQ("remount", remount_mount_options[4]);
   EXPECT_EQ(kExpectedMountLabelOption, remount_mount_options[5]);
+
+  std::vector<std::string> custom_mount_options =
+      CrosDisksClient::ComposeMountOptions({"foo", "bar=baz"}, kMountLabel,
+                                           MOUNT_ACCESS_MODE_READ_WRITE,
+                                           REMOUNT_OPTION_MOUNT_NEW_DEVICE);
+  ASSERT_EQ(7U, custom_mount_options.size());
+  EXPECT_EQ("foo", custom_mount_options[0]);
+  EXPECT_EQ("bar=baz", custom_mount_options[1]);
+  EXPECT_EQ("nodev", custom_mount_options[2]);
+  EXPECT_EQ("noexec", custom_mount_options[3]);
+  EXPECT_EQ("nosuid", custom_mount_options[4]);
+  EXPECT_EQ("rw", custom_mount_options[5]);
+  EXPECT_EQ(kExpectedMountLabelOption, custom_mount_options[6]);
 }
 
 }  // namespace chromeos
diff --git a/chromeos/dbus/fake_cros_disks_client.cc b/chromeos/dbus/fake_cros_disks_client.cc
index 6c96f6b580705..990c5a724985b 100644
--- a/chromeos/dbus/fake_cros_disks_client.cc
+++ b/chromeos/dbus/fake_cros_disks_client.cc
@@ -69,6 +69,7 @@ void FakeCrosDisksClient::RemoveObserver(Observer* observer) {
 void FakeCrosDisksClient::Mount(const std::string& source_path,
                                 const std::string& source_format,
                                 const std::string& mount_label,
+                                const std::vector<std::string>& mount_options,
                                 MountAccessMode access_mode,
                                 RemountOption remount,
                                 VoidDBusMethodCallback callback) {
diff --git a/chromeos/dbus/fake_cros_disks_client.h b/chromeos/dbus/fake_cros_disks_client.h
index ec9a8b23fbdc1..b78d3a4f13c15 100644
--- a/chromeos/dbus/fake_cros_disks_client.h
+++ b/chromeos/dbus/fake_cros_disks_client.h
@@ -35,6 +35,7 @@ class CHROMEOS_EXPORT FakeCrosDisksClient : public CrosDisksClient {
   void Mount(const std::string& source_path,
              const std::string& source_format,
              const std::string& mount_label,
+             const std::vector<std::string>& mount_options,
              MountAccessMode access_mode,
              RemountOption remount,
              VoidDBusMethodCallback callback) override;
diff --git a/chromeos/disks/disk_mount_manager.cc b/chromeos/disks/disk_mount_manager.cc
index 90bdc2e3e1f77..366482f9d0c98 100644
--- a/chromeos/disks/disk_mount_manager.cc
+++ b/chromeos/disks/disk_mount_manager.cc
@@ -67,6 +67,7 @@ class DiskMountManagerImpl : public DiskMountManager,
   void MountPath(const std::string& source_path,
                  const std::string& source_format,
                  const std::string& mount_label,
+                 const std::vector<std::string>& mount_options,
                  MountType type,
                  MountAccessMode access_mode) override {
     // Hidden and non-existent devices should not be mounted.
@@ -79,7 +80,7 @@ class DiskMountManagerImpl : public DiskMountManager,
       }
     }
     cros_disks_client_->Mount(
-        source_path, source_format, mount_label, access_mode,
+        source_path, source_format, mount_label, mount_options, access_mode,
         REMOUNT_OPTION_MOUNT_NEW_DEVICE,
         base::BindOnce(&DiskMountManagerImpl::OnMount,
                        weak_ptr_factory_.GetWeakPtr(), source_path, type));
@@ -356,7 +357,7 @@ class DiskMountManagerImpl : public DiskMountManager,
     access_modes_[source_path] = access_mode;
 
     cros_disks_client_->Mount(
-        mount_point->second.source_path, std::string(), std::string(),
+        mount_point->second.source_path, std::string(), std::string(), {},
         access_mode, REMOUNT_OPTION_REMOUNT_EXISTING_DEVICE,
         base::BindOnce(&DiskMountManagerImpl::OnMount,
                        weak_ptr_factory_.GetWeakPtr(), source_path,
diff --git a/chromeos/disks/disk_mount_manager.h b/chromeos/disks/disk_mount_manager.h
index f8be5edfe44af..e65a5c08cb261 100644
--- a/chromeos/disks/disk_mount_manager.h
+++ b/chromeos/disks/disk_mount_manager.h
@@ -311,6 +311,7 @@ class CHROMEOS_EXPORT DiskMountManager {
   virtual void MountPath(const std::string& source_path,
                          const std::string& source_format,
                          const std::string& mount_label,
+                         const std::vector<std::string>& mount_options,
                          MountType type,
                          MountAccessMode access_mode) = 0;
 
diff --git a/chromeos/disks/disk_mount_manager_unittest.cc b/chromeos/disks/disk_mount_manager_unittest.cc
index da0da3394578a..4219b47056016 100644
--- a/chromeos/disks/disk_mount_manager_unittest.cc
+++ b/chromeos/disks/disk_mount_manager_unittest.cc
@@ -953,10 +953,10 @@ TEST_F(DiskMountManagerTest, MountPath_RecordAccessMode) {
   const std::string kMountPath1 = "/media/foo";
   const std::string kMountPath2 = "/media/bar";
 
-  manager->MountPath(kSourcePath1, kSourceFormat, std::string(),
+  manager->MountPath(kSourcePath1, kSourceFormat, std::string(), {},
                      chromeos::MOUNT_TYPE_DEVICE,
                      chromeos::MOUNT_ACCESS_MODE_READ_WRITE);
-  manager->MountPath(kSourcePath2, kSourceFormat, std::string(),
+  manager->MountPath(kSourcePath2, kSourceFormat, std::string(), {},
                      chromeos::MOUNT_TYPE_DEVICE,
                      chromeos::MOUNT_ACCESS_MODE_READ_ONLY);
   // Simulate cros_disks reporting mount completed.
@@ -999,7 +999,7 @@ TEST_F(DiskMountManagerTest, MountPath_ReadOnlyDevice) {
 
   // Attempt to mount a read-only device in read-write mode.
   manager->MountPath(kReadOnlyDeviceSourcePath, kSourceFormat, std::string(),
-                     chromeos::MOUNT_TYPE_DEVICE,
+                     {}, chromeos::MOUNT_TYPE_DEVICE,
                      chromeos::MOUNT_ACCESS_MODE_READ_WRITE);
   // Simulate cros_disks reporting mount completed.
   fake_cros_disks_client_->NotifyMountCompleted(
diff --git a/chromeos/disks/mock_disk_mount_manager.cc b/chromeos/disks/mock_disk_mount_manager.cc
index 07c3a1d83939c..2a35ec053fa55 100644
--- a/chromeos/disks/mock_disk_mount_manager.cc
+++ b/chromeos/disks/mock_disk_mount_manager.cc
@@ -156,7 +156,7 @@ void MockDiskMountManager::SetupDefaultReplies() {
   EXPECT_CALL(*this, FindDiskBySourcePath(_))
       .Times(AnyNumber());
   EXPECT_CALL(*this, EnsureMountInfoRefreshed(_, _)).Times(AnyNumber());
-  EXPECT_CALL(*this, MountPath(_, _, _, _, _)).Times(AnyNumber());
+  EXPECT_CALL(*this, MountPath(_, _, _, _, _, _)).Times(AnyNumber());
   EXPECT_CALL(*this, UnmountPath(_, _, _))
       .Times(AnyNumber());
   EXPECT_CALL(*this, RemountAllRemovableDrives(_)).Times(AnyNumber());
diff --git a/chromeos/disks/mock_disk_mount_manager.h b/chromeos/disks/mock_disk_mount_manager.h
index 598d920e67e6f..48e6b72e392c9 100644
--- a/chromeos/disks/mock_disk_mount_manager.h
+++ b/chromeos/disks/mock_disk_mount_manager.h
@@ -37,10 +37,11 @@ class MockDiskMountManager : public DiskMountManager {
                      const DiskMountManager::MountPointMap&(void));
   MOCK_METHOD2(EnsureMountInfoRefreshed,
                void(const EnsureMountInfoRefreshedCallback&, bool));
-  MOCK_METHOD5(MountPath,
+  MOCK_METHOD6(MountPath,
                void(const std::string&,
                     const std::string&,
                     const std::string&,
+                    const std::vector<std::string>&,
                     MountType,
                     MountAccessMode));
   MOCK_METHOD3(UnmountPath, void(const std::string&,