cc: Fix lost context handling when using impl-side painting.

cc/layer_tree_host_impl.cc

 // Copyright 2011 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 "cc/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
@@ skipping 948 matching lines @@
     m_renderer->setVisible(visible);
 
     setBackgroundTickingEnabled(!m_visible && !m_animationRegistrar->active_animation_controllers().empty());
 }
 
 bool LayerTreeHostImpl::initializeRenderer(scoped_ptr<OutputSurface> outputSurface)
 {
     // Since we will create a new resource provider, we cannot continue to use
     // the old resources (i.e. renderSurfaces and texture IDs). Clear them
     // before we destroy the old resource provider.
-    if (rootLayer()) {
+    if (rootLayer())
         clearRenderSurfaces();
-        sendDidLoseOutputSurfaceRecursive(rootLayer());
-    }
+    if (activeTree()->RootLayer())
+        sendDidLoseOutputSurfaceRecursive(activeTree()->RootLayer());
+    if (pendingTree() && pendingTree()->RootLayer())
+        sendDidLoseOutputSurfaceRecursive(pendingTree()->RootLayer());
+
     // Note: order is important here.
     m_renderer.reset();
     m_tileManager.reset();
     m_resourceProvider.reset();
     m_outputSurface.reset();
 
     if (!outputSurface->BindToClient(this))
         return false;
 
     scoped_ptr<ResourceProvider> resourceProvider = ResourceProvider::create(outputSurface.get());
@@ skipping 656 matching lines @@
 }
 
 skia::RefPtr<SkPicture> LayerTreeHostImpl::capturePicture()
 {
     LayerTreeImpl* tree = pendingTree() ? pendingTree() : activeTree();
     LayerImpl* layer = getNonCompositedContentLayerRecursive(tree->RootLayer());
     return layer ? layer->getPicture() : skia::RefPtr<SkPicture>();
 }
 
 }  // namespace cc