Send vsync notification from browser to renderer

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index d83b077dde887ed785df5bfd98f976ae48a34c5e..0aba54f50069ebe2e772d03497da0cd7410c4b1d 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -760,7 +760,7 @@ IPC_MESSAGE_ROUTED0(ViewMsg_MouseLockLost)
 IPC_MESSAGE_ROUTED1(ViewMsg_OrientationChangeEvent,
                     int /* orientation */)
 
-// Sent by the renderer when the parameters for vsync alignment have changed.
+// Sent by the browser when the parameters for vsync alignment have changed.
 IPC_MESSAGE_ROUTED2(ViewMsg_UpdateVSyncParameters,
                     base::TimeTicks /* timebase */,
                     base::TimeDelta /* interval */)
@@ -1368,6 +1368,11 @@ IPC_MESSAGE_ROUTED3(ViewMsg_UpdateTopControlsState,
 
 IPC_MESSAGE_ROUTED0(ViewMsg_ShowImeIfNeeded)
 
+// Sent by the browser when the display vsync signal was triggered and the
+// renderer should generate a new frame.
+IPC_MESSAGE_ROUTED1(ViewMsg_DidVSync,
+                    base::TimeTicks /* frame_time */)
+
 #elif defined(OS_MACOSX)
 // Let the RenderView know its window has changed visibility.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetWindowVisibility,
@@ -2360,6 +2365,12 @@ IPC_MESSAGE_CONTROL2(ViewHostMsg_RunWebAudioMediaCodec,
                      base::SharedMemoryHandle /* encoded_data_handle */,
                      base::FileDescriptor /* pcm_output */)
 
+// Sent by renderer to request a ViewMsg_VSync message for upcoming display
+// vsync events. If |enabled| is true, the vsync message will continue to be be
+// delivered until the notification is disabled.
+IPC_MESSAGE_ROUTED1(ViewHostMsg_SetVSyncNotificationEnabled,
+                    bool /* enabled */)
+
 #elif defined(OS_MACOSX)
 // Request that the browser load a font into shared memory for us.
 IPC_SYNC_MESSAGE_CONTROL1_3(ViewHostMsg_LoadFont,