Adding ArcBridge interface for synchronizing brightness settings

components/arc/power/arc_power_bridge.h

Index: components/arc/power/arc_power_bridge.h
diff --git a/components/arc/power/arc_power_bridge.h b/components/arc/power/arc_power_bridge.h
index c459cffbb07d22b9066368ff692ff99dfba014c3..328ded979b15ad736e3b53cbdd1e81fc852f7f4a 100644
--- a/components/arc/power/arc_power_bridge.h
+++ b/components/arc/power/arc_power_bridge.h
@@ -37,6 +37,7 @@ class ArcPowerBridge : public ArcService,
   // chromeos::PowerManagerClient::Observer overrides.
   void SuspendImminent() override;
   void SuspendDone(const base::TimeDelta& sleep_duration) override;
+  void BrightnessChanged(int level, bool user_initiated) override;
 
   // DisplayConfigurator::Observer overrides.
   void OnPowerStateChanged(chromeos::DisplayPowerState power_state) override;
@@ -45,9 +46,11 @@ class ArcPowerBridge : public ArcService,
   void OnAcquireDisplayWakeLock(mojom::DisplayWakeLockType type) override;
   void OnReleaseDisplayWakeLock(mojom::DisplayWakeLockType type) override;
   void IsDisplayOn(const IsDisplayOnCallback& callback) override;
+  void OnScreenBrightnessUpdateRequest(double percent) override;
 
  private:
   void ReleaseAllDisplayWakeLocks();
+  void UpdateAndroidScreenBrightness(double percent);
 
   mojo::Binding<mojom::PowerHost> binding_;
 
@@ -55,6 +58,8 @@ class ArcPowerBridge : public ArcService,
   // held by ARC.
   std::multimap<mojom::DisplayWakeLockType, int> wake_locks_;
 
+  base::WeakPtrFactory<ArcPowerBridge> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ArcPowerBridge);
 };