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 1efb35c39fea0dc33cd1167874a7036ab5713f87..5bcbaa9f044ef142dbbd4e371e5718388256a2fe 100644
--- a/cc/test/fake_picture_layer_impl.h
+++ b/cc/test/fake_picture_layer_impl.h
@@ -110,6 +110,13 @@ class FakePictureLayerImpl : public PictureLayerImpl {
   void ResetAllTilesPriorities();
   PictureLayerTilingSet* GetTilings() { return tilings_.get(); }
 
+  size_t lost_output_surface_count() const {
+    return lost_output_surface_count_;
+  }
+  void reset_lost_output_surface_count() { lost_output_surface_count_ = 0; }
+
+  virtual void ReleaseResources() OVERRIDE;
+
  protected:
   FakePictureLayerImpl(
       LayerTreeImpl* tree_impl,
@@ -128,6 +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 lost_output_surface_count_;
 };
 
 }  // namespace cc