mus: Fix showing guest views in --mash and --mus.

content/browser/frame_host/render_widget_host_view_child_frame.cc

 // Copyright 2014 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/frame_host/render_widget_host_view_child_frame.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 393 matching lines @@
   if (!frame_connector_)
     return;
   ProcessCompositorFrame(local_surface_id, std::move(frame));
 }
 
 void RenderWidgetHostViewChildFrame::OnBeginFrameDidNotSwap(
     const cc::BeginFrameAck& ack) {
   support_->BeginFrameDidNotSwap(ack);
 }
 
+void RenderWidgetHostViewChildFrame::OnSurfaceChanged(
+    const cc::SurfaceInfo& surface_info) {
+  cc::SurfaceSequence sequence(frame_sink_id_, next_surface_sequence_++);
+  SendSurfaceInfoToEmbedderImpl(surface_info, sequence);
+}
+
 void RenderWidgetHostViewChildFrame::ProcessFrameSwappedCallbacks() {
   // We only use callbacks once, therefore we make a new list for registration
   // before we start, and discard the old list entries when we are done.
   FrameSwappedCallbackList process_callbacks;
   process_callbacks.swap(frame_swapped_callbacks_);
   for (std::unique_ptr<base::Closure>& callback : process_callbacks)
     callback->Run();
 }
 
 gfx::Rect RenderWidgetHostViewChildFrame::GetBoundsInRootWindow() {
@@ skipping 278 matching lines @@
                                                       frame_sink_id_);
   }
   support_.reset();
 }
 
 bool RenderWidgetHostViewChildFrame::HasEmbedderChanged() {
   return false;
 }
 
 }  // namespace content