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

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 1901 matching lines @@
       switches::kEnableThreadedCompositing);
   bool has_disable = CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kDisableThreadedCompositing);
   DCHECK(!is_thread_trial || !has_disable);
   bool enable_threaded_compositing =
       is_thread_trial || (has_enable && !has_disable);
   if (!enable_threaded_compositing)
     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
   // indicate that no callback is in progress (i.e. without this line
   // DelayedAutoResized will not get called again).
   new_auto_size_.SetSize(0, 0);
   if (!should_auto_resize_)
     return;
 
   OnRenderAutoResized(new_size);
 }
 
 }  // namespace content