Send vsync timebase updates to the browser compositor

content/browser/gpu/gpu_process_host_ui_shim.cc

Index: content/browser/gpu/gpu_process_host_ui_shim.cc
diff --git a/content/browser/gpu/gpu_process_host_ui_shim.cc b/content/browser/gpu/gpu_process_host_ui_shim.cc
index 575f4b516354d5f2b23b233e320e22e90514a102..93aa1e5c96158568b249c44c7ca0f7f74a8bb773 100644
--- a/content/browser/gpu/gpu_process_host_ui_shim.cc
+++ b/content/browser/gpu/gpu_process_host_ui_shim.cc
@@ -203,6 +203,9 @@ bool GpuProcessHostUIShim::OnControlMessageReceived(
                         OnAcceleratedSurfaceRelease)
     IPC_MESSAGE_HANDLER(GpuHostMsg_VideoMemoryUsageStats,
                         OnVideoMemoryUsageStatsReceived);
+    IPC_MESSAGE_HANDLER(GpuHostMsg_UpdateVSyncParameters,
+                        OnUpdateVSyncParameters)
+
 #if defined(TOOLKIT_GTK) || defined(OS_WIN)
     IPC_MESSAGE_HANDLER(GpuHostMsg_ResizeView, OnResizeView)
 #endif
@@ -213,6 +216,25 @@ bool GpuProcessHostUIShim::OnControlMessageReceived(
   return true;
 }
 
+void GpuProcessHostUIShim::OnUpdateVSyncParameters(int surface_id,
+                                             base::TimeTicks timebase,
+                                             base::TimeDelta interval) {
+
+  int render_process_id = 0;
+  int render_widget_id = 0;
+  if (!GpuSurfaceTracker::Get()->GetRenderWidgetIDForSurface(
+      surface_id, &render_process_id, &render_widget_id)) {
+    return;
+  }
+  RenderProcessHost* host = RenderProcessHost::FromID(render_process_id);
+  if (!host)
+    return;
+  RenderWidgetHost* rwh = host->GetRenderWidgetHostByID(render_widget_id);
+  if (!rwh)
+    return;
+  RenderWidgetHostImpl::From(rwh)->UpdateVSyncParameters(timebase, interval);
+}
+
 void GpuProcessHostUIShim::OnLogMessage(
     int level,
     const std::string& header,