Make RenderWidget responsible for the composited view's lifetime

content/renderer/render_view_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/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/bind.h"
@@ skipping 5645 matching lines @@
 }
 
 void RenderViewImpl::OnClearFocusedNode() {
   if (webview())
     webview()->clearFocusedNode();
 }
 
 void RenderViewImpl::OnSetBackground(const SkBitmap& background) {
   if (webview())
     webview()->setIsTransparent(!background.empty());
+  if (web_layer_tree_view_)
+    web_layer_tree_view_->setHasTransparentBackground(!background.empty());
 
   SetBackground(background);
 }
 
 void RenderViewImpl::OnSetAccessibilityMode(AccessibilityMode new_mode) {
   if (accessibility_mode_ == new_mode)
     return;
   accessibility_mode_ = new_mode;
   if (renderer_accessibility_) {
     delete renderer_accessibility_;
@@ skipping 829 matching lines @@
 }
 #endif
 
 void RenderViewImpl::OnReleaseDisambiguationPopupDIB(
     TransportDIB::Handle dib_handle) {
   TransportDIB* dib = TransportDIB::CreateWithHandle(dib_handle);
   RenderProcess::current()->ReleaseTransportDIB(dib);
 }
 
 }  // namespace content