Adding ArcBridge interface for synchronizing brightness settings

components/arc/power/arc_power_bridge.cc

Index: components/arc/power/arc_power_bridge.cc
diff --git a/components/arc/power/arc_power_bridge.cc b/components/arc/power/arc_power_bridge.cc
index a9a47f52230fa89212c416b9dfca5a0d4cbbd55d..7e461a38cc574421d74e794c26af5715ff1ba96d 100644
--- a/components/arc/power/arc_power_bridge.cc
+++ b/components/arc/power/arc_power_bridge.cc
@@ -74,6 +74,16 @@ void ArcPowerBridge::OnPowerStateChanged(
   power_instance->SetInteractive(enabled);
 }
 
+void ArcPowerBridge::NotifyBrightnessChange(double percent) {
+  mojom::PowerInstance* power_instance = ARC_GET_INSTANCE_FOR_METHOD(
+      arc_bridge_service()->power(), UpdateBrightness);
+  if (!power_instance)
+    return;
+
+  int brightness = round(percent * 2.55);

[Muyuan, 2017/04/05 18:41:10]

Document why multiply this by 2.55

[yueli, 2017/04/05 19:59:47]

Done.

+  power_instance->UpdateBrightness(brightness);
+}
+
 void ArcPowerBridge::OnAcquireDisplayWakeLock(mojom::DisplayWakeLockType type) {
   if (!chromeos::PowerPolicyController::IsInitialized()) {
     LOG(WARNING) << "PowerPolicyController is not available";
@@ -126,6 +136,28 @@ void ArcPowerBridge::IsDisplayOn(const IsDisplayOnCallback& callback) {
       ash::Shell::GetInstance()->display_configurator()->IsDisplayOn());
 }
 
+void ArcPowerBridge::SetBrightness(int32_t brightness) {
+  if (!chromeos::DBusThreadManager::IsInitialized()) {
+    LOG(WARNING) << "DBusThreadManager is not available";
+    return;
+  }
+  chromeos::DBusThreadManager::Get()
+      ->GetPowerManagerClient()
+      ->SetScreenBrightnessPercent(brightness / 2.55, true);
+  return;
+}
+
+void ArcPowerBridge::SyncBrightness() {
+  if (!chromeos::DBusThreadManager::IsInitialized()) {
+    LOG(WARNING) << "DBusThreadManager is not available";
+    return;
+  }
+  chromeos::DBusThreadManager::Get()
+      ->GetPowerManagerClient()
+      ->SyncScreenBrightness();
+  return;
+}
+
 void ArcPowerBridge::ReleaseAllDisplayWakeLocks() {
   if (!chromeos::PowerPolicyController::IsInitialized()) {
     LOG(WARNING) << "PowerPolicyController is not available";