Introduce AutoApproveEnterpriseSharedSessions feature flag

This feature would guard the feature development of auto-approving
session connection requests for enterprise shared CRD sessions.

To state it explicitly auto approval of the connection request dialog
would only take place if:
* the device is in a managed environment.
* there was a local user activity in the last 5 minutes.

The connection dialog would also show a 30 seconds countdown in the
request dialog before auto-approving the connection request.

Bug: b:397902801
Change-Id: I824109ca4701bd881913bc88e2780e0b33e9da98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6309388
Reviewed-by: Joe Downing <joedow@chromium.org>
Reviewed-by: Jeroen Dhollander <jeroendh@google.com>
Commit-Queue: Ashutosh Singhal <macinashutosh@google.com>
Cr-Commit-Position: refs/heads/main@{#1427185}

remoting/host/chromeos/features.cc

@@ -20,4 +20,8 @@ BASE_FEATURE(kEnableCrdSharedSessionToUnattendedDevice,
              "EnableCrdSharedSessionToUnattendedDevice",
              base::FEATURE_DISABLED_BY_DEFAULT);
 
+BASE_FEATURE(kAutoApproveEnterpriseSharedSessions,
+             "EnableAutoApproveEnterpriseSharedSessions",
+             base::FEATURE_DISABLED_BY_DEFAULT);
+
 }  // namespace remoting::features

remoting/host/chromeos/features.h

@@ -19,6 +19,10 @@ BASE_DECLARE_FEATURE(kEnableCrdFileTransferForKiosk);
 // Enable to allow shared CRD session to the login/lock screen.
 BASE_DECLARE_FEATURE(kEnableCrdSharedSessionToUnattendedDevice);
 
+// Enable to auto-approve session connect request for enterprise shared CRD
+// sessions.
+BASE_DECLARE_FEATURE(kAutoApproveEnterpriseSharedSessions);
+
 }  // namespace remoting::features
 
 #endif  // REMOTING_HOST_CHROMEOS_FEATURES_H_