Drop frontbuffers with ui-use-gpu-process, synchronized with browser, decoupled from backbuffer dro…

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index de65f0cab2706c712874cc34f3376e4c9b3a565f..ba5e3200a54e8cc9c1167287cf4d8e8f27c251fa 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1914,6 +1914,21 @@ void RenderWidgetHostImpl::AcknowledgeSwapBuffersToRenderer() {
     Send(new ViewMsg_SwapBuffers_ACK(routing_id_));
 }
 
+#if defined(USE_AURA)
+// static
+void RenderWidgetHostImpl::SendFrontSurfaceIsProtected(
+    bool is_protected,
+    uint32 protection_state_id,
+    int32 route_id,
+    int gpu_host_id) {
+  GpuProcessHostUIShim* ui_shim = GpuProcessHostUIShim::FromID(gpu_host_id);
+  if (ui_shim) {
+    ui_shim->Send(new AcceleratedSurfaceMsg_SetFrontSurfaceIsProtected(
+        route_id, is_protected, protection_state_id));
+  }
+}
+#endif
+
 void RenderWidgetHostImpl::DelayedAutoResized() {
   gfx::Size new_size = new_auto_size_;
   // Clear the new_auto_size_ since the empty value is used as a flag to