Adding ArcBridge interface for synchronizing brightness settings

chromeos/dbus/power_manager_client.h

Index: chromeos/dbus/power_manager_client.h
diff --git a/chromeos/dbus/power_manager_client.h b/chromeos/dbus/power_manager_client.h
index 1381287cecf36975d93e0b9c67830272cf51f1a6..8e0c92518737d70aa79139e9bb879244da831051 100644
--- a/chromeos/dbus/power_manager_client.h
+++ b/chromeos/dbus/power_manager_client.h
@@ -61,6 +61,9 @@ class CHROMEOS_EXPORT PowerManagerClient : public DBusClient {
     // |user_initiated| is true if the action is initiated by the user.
     virtual void BrightnessChanged(int level, bool user_initiated) {}
 
+    // Noitify android setting about brightness change

[Muyuan, 2017/04/05 18:41:08]

dbus/power_manager_client is pretty general and it exists in many platforms that
you shouldn't say "notify android".. 

[yueli, 2017/04/05 19:59:46]

Done.

+    virtual void NotifyBrightnessChange(double brightness) {}

[Muyuan, 2017/04/05 18:41:08]

This function is probably not needed. You can override BrightnessChanged in
ArcPowerBridge

[yueli, 2017/04/05 19:59:46]

Done.

+
     // Called when peripheral device battery status is received.
     // |path| is the sysfs path for the battery of the peripheral device.
     // |name| is the human readble name of the device.
@@ -165,6 +168,9 @@ class CHROMEOS_EXPORT PowerManagerClient : public DBusClient {
   virtual void GetScreenBrightnessPercent(
       const GetScreenBrightnessPercentCallback& callback) = 0;
 
+  // Get the current screen brightness and syncrhonize it to android settings
+  virtual void SyncScreenBrightness() = 0;
+
   // Decreases the keyboard brightness.
   virtual void DecreaseKeyboardBrightness() = 0;