arc: Add settings bridge

Synchronize font and spoken feedback enabled settings from Chrome to
Android on Android start and keep settings in sync by listening for
Chrome preference changes.

Related changes:
* ag/822770
* ag/822726

BUG=561003
TEST=./unit_tests --gtest_filter='Arc*'
TEST=Build both sides. Change font size in chrome://settings or enable
     spoken feedback (Ctrl+Alt+Z). Observe change in Android.

Review URL: https://codereview.chromium.org/1539633002

Cr-Commit-Position: refs/heads/master@{#366145}

1 files changed, 3 insertions, 1 deletions

diff --git a/components/arc/arc_service_manager.h b/components/arc/arc_service_manager.h
index ed4b434..07d6273 100644
--- a/components/arc/arc_service_manager.h
+++ b/components/arc/arc_service_manager.h
@@ -13,12 +13,13 @@ namespace arc {
 
 class ArcBridgeService;
 class ArcInputBridge;
+class ArcSettingsBridge;
 
 // Manages creation and destruction of services that communicate with the ARC
 // instance via the ArcBridgeService.
 class ArcServiceManager {
  public:
-  ArcServiceManager();
+  explicit ArcServiceManager(scoped_ptr<ArcSettingsBridge> settings_bridge);
   virtual ~ArcServiceManager();
 
   // |arc_bridge_service| can only be accessed on the thread that this
@@ -33,6 +34,7 @@ class ArcServiceManager {
   base::ThreadChecker thread_checker_;
   scoped_ptr<ArcBridgeService> arc_bridge_service_;
   scoped_ptr<ArcInputBridge> arc_input_bridge_;
+  scoped_ptr<ArcSettingsBridge> arc_settings_bridge_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcServiceManager);
 };