cc: Use impl-side painting in LTH context lost tests.

cc/test/fake_picture_layer_impl.h

Index: cc/test/fake_picture_layer_impl.h
diff --git a/cc/test/fake_picture_layer_impl.h b/cc/test/fake_picture_layer_impl.h
index fbaecf74951accda0b8b1e8eff21736e6059e561..a06805c08ee44af979db607b4c91dfb5ef645390 100644
--- a/cc/test/fake_picture_layer_impl.h
+++ b/cc/test/fake_picture_layer_impl.h
@@ -112,6 +112,11 @@ class FakePictureLayerImpl : public PictureLayerImpl {
   void ResetAllTilesPriorities();
   PictureLayerTilingSet* GetTilings() { return tilings_.get(); }
 
+  size_t release_resources_count() const { return release_resources_count_; }
+  void reset_release_resources_count() { release_resources_count_ = 0; }
+
+  virtual void ReleaseResources() OVERRIDE;
+
  protected:
   FakePictureLayerImpl(
       LayerTreeImpl* tree_impl,
@@ -130,6 +135,7 @@ class FakePictureLayerImpl : public PictureLayerImpl {
   size_t did_become_active_call_count_;
   bool has_valid_tile_priorities_;
   bool use_set_valid_tile_priorities_flag_;
+  size_t release_resources_count_;
 };
 
 }  // namespace cc