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 c87ff495a051340307cda2ef180a4421f39f2cc6..5501d9bc417663d5299d2daa499fe733a8867d6b 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -750,11 +750,22 @@ 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 */)
 
+// 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_EnableVSyncNotification,
+                    bool /* enabled */)
+
+// 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 */)
+
 // Set the top-level frame to the provided name.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetName,
                     std::string /* frame_name */)