Added Hand attribute to Gamepad

ppapi/shared_impl/ppb_gamepad_shared.h

Index: ppapi/shared_impl/ppb_gamepad_shared.h
diff --git a/ppapi/shared_impl/ppb_gamepad_shared.h b/ppapi/shared_impl/ppb_gamepad_shared.h
index ae06bf2605a3c6522b7d422843657ae9469b770d..8787320ef9929a95d6f10c4109814b2528006b68 100644
--- a/ppapi/shared_impl/ppb_gamepad_shared.h
+++ b/ppapi/shared_impl/ppb_gamepad_shared.h
@@ -49,6 +49,12 @@ struct WebKitGamepadPose {
   WebKitGamepadVector linearAcceleration;
 };
 
+enum WebKitGamepadHand {
+  WEBKIT_GAMEPAD_HAND_NONE = 0,
+  WEBKIT_GAMEPAD_HAND_LEFT = 1,
+  WEBKIT_GAMEPAD_HAND_RIGHT = 2
+};
+
 // This must match the definition of blink::Gamepad. The GamepadHost unit test
 // has some compile asserts to validate this.
 struct WebKitGamepad {
@@ -83,6 +89,8 @@ struct WebKitGamepad {
   base::char16 mapping[kMappingLengthCap];
 
   WebKitGamepadPose pose;
+
+  WebKitGamepadHand hand;
 };
 
 // This must match the definition of blink::Gamepads. The GamepadHost unit