Made double-tap zoom work in pinch virtual viewport mode (Chromium-side).

cc/test/fake_layer_tree_host_client.h

 // Copyright 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.
 
 #ifndef CC_TEST_FAKE_LAYER_TREE_HOST_CLIENT_H_
 #define CC_TEST_FAKE_LAYER_TREE_HOST_CLIENT_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/input/input_handler.h"
 #include "cc/test/test_context_provider.h"
@@ skipping 13 matching lines @@
     DELEGATED_SOFTWARE
   };
   explicit FakeLayerTreeHostClient(RendererOptions options);
   virtual ~FakeLayerTreeHostClient();
 
   // LayerTreeHostClient implementation.
   virtual void WillBeginMainFrame(int frame_id) OVERRIDE {}
   virtual void DidBeginMainFrame() OVERRIDE {}
   virtual void BeginMainFrame(const BeginFrameArgs& args) OVERRIDE {}
   virtual void Layout() OVERRIDE {}
+  virtual void ApplyViewportDeltas(const gfx::Vector2d& inner_delta,
+                                   const gfx::Vector2d& outer_delta,
+                                   float page_scale,
+                                   float top_controls_delta) OVERRIDE {}
   virtual void ApplyViewportDeltas(const gfx::Vector2d& scroll_delta,
                                    float page_scale,
                                    float top_controls_delta) OVERRIDE {}
 
   virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback) OVERRIDE;
   virtual void DidInitializeOutputSurface() OVERRIDE {}
   virtual void WillCommit() OVERRIDE {}
   virtual void DidCommit() OVERRIDE {}
   virtual void DidCommitAndDrawFrame() OVERRIDE {}
   virtual void DidCompleteSwapBuffers() OVERRIDE {}
 
   // LayerTreeHostSingleThreadClient implementation.
   virtual void DidPostSwapBuffers() OVERRIDE {}
   virtual void DidAbortSwapBuffers() OVERRIDE {}
 
  private:
   bool use_software_rendering_;
   bool use_delegating_renderer_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_LAYER_TREE_HOST_CLIENT_H_