Adding ArcBridge interface for synchronizing brightness settings

components/arc/common/power.mojom

Index: components/arc/common/power.mojom
diff --git a/components/arc/common/power.mojom b/components/arc/common/power.mojom
index 195c7c828e391bbe58138f3472b98c25ba54b0cf..949517a04b71366499289307b8a47e1da864f492 100644
--- a/components/arc/common/power.mojom
+++ b/components/arc/common/power.mojom
@@ -19,7 +19,7 @@ enum DisplayWakeLockType {
   DIM = 1
 };
 
-// Next method ID: 3
+// Next method ID: 4
 interface PowerHost {
   // Acquire and release wake locks on the host side.
   OnAcquireDisplayWakeLock@0(DisplayWakeLockType type);
@@ -27,9 +27,13 @@ interface PowerHost {
 
   // Checks if there is a display on.
   [MinVersion=1] IsDisplayOn@2() => (bool is_on);
+
+  // Set screen brightness.
+  // |brightness| is of the range [0, 255]
+  [MinVersion=2] SetBrightness@3(int32 brightness);

[Luis Héctor Chávez, 2017/04/05 21:28:02]

What happened to the request to make this |double percentage| instead of |int32
brightness|?

[Daniel Erat, 2017/04/05 21:47:21]

agreed; "double percentage" is better.

[yueli, 2017/04/05 23:27:17]

Done.

 };
 
-// Next method ID: 4
+// Next method ID: 5
 interface PowerInstance {
   // Establishes full-duplex communication with the host.
   Init@0(PowerHost host_ptr);
@@ -43,4 +47,8 @@ interface PowerInstance {
 
   // Called when the system has just resumed.
   [MinVersion=2] Resume@3();
+
+  // Update android brightness settings.
+  // |brightness| is of the range [0, 255]
+  [MinVersion=3] UpdateBrightness@4(int32 brightness);
 };