libchrome: add support for synchronous PropertySet::Set to dbus

The existing PropertySet::Set function is asynchrounous.
This CL adds the synchrounous version of PropertySet::Set.
It is defined as PropertySet::SetAndBlock.

BUG=https://b.corp.google.com/u/0/issues/24131409
TEST=manually tested

Review URL: https://codereview.chromium.org/1361503003

Cr-Commit-Position: refs/heads/master@{#350268}

dbus/property.cc

@@ -174,6 +174,22 @@ void PropertySet::Set(PropertyBase* property, SetCallback callback) {
                                        callback));
 }
 
+bool PropertySet::SetAndBlock(PropertyBase* property) {
+  MethodCall method_call(kPropertiesInterface, kPropertiesSet);
+  MessageWriter writer(&method_call);
+  writer.AppendString(interface());
+  writer.AppendString(property->name());
+  property->AppendSetValueToWriter(&writer);
+
+  DCHECK(object_proxy_);
+  scoped_ptr<dbus::Response> response(
+      object_proxy_->CallMethodAndBlock(&method_call,
+      ObjectProxy::TIMEOUT_USE_DEFAULT));
+  if (response.get())
+    return true;
+  return false;
+}
+
 void PropertySet::OnSet(PropertyBase* property,
                         SetCallback callback,
                         Response* response) {

dbus/property.h

@@ -276,6 +276,8 @@ class CHROME_DBUS_EXPORT PropertySet {
   // depending on the remote object. This method may be overridden by
   // sub-classes if interfaces use different method calls.
   virtual void Set(PropertyBase* property, SetCallback callback);
+  // The sychronous version of Set().
+  virtual bool SetAndBlock(PropertyBase* property);
   virtual void OnSet(PropertyBase* property, SetCallback callback,
                      Response* response);
 
@@ -389,6 +391,12 @@ class CHROME_DBUS_EXPORT Property : public PropertyBase {
     property_set()->Set(this, callback);
   }
 
+  // The sychronous version of Set().
+  virtual bool SetAndBlock(const T& value) {
+    set_value_ = value;
+    return property_set()->SetAndBlock(this);
+  }
+
   // Method used by PropertySet to retrieve the value from a MessageReader,
   // no knowledge of the contained type is required, this method returns
   // true if its expected type was found, false if not.