android webview: Keep zoom methods synchronous

content/public/test/test_synchronous_compositor_android.h

 // Copyright 2014 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 CONTENT_PUBLIC_TEST_TEST_SYNCHRONOUS_COMPOSITOR_ANDROID_H_
 #define CONTENT_PUBLIC_TEST_TEST_SYNCHRONOUS_COMPOSITOR_ANDROID_H_
 
 #include <stddef.h>
 
 #include <vector>
@@ skipping 21 matching lines @@
       const gfx::Rect& clip,
       const gfx::Rect& viewport_rect_for_tile_priority,
       const gfx::Transform& transform_for_tile_priority) override;
   void ReturnResources(uint32_t output_surface_id,
                        const cc::CompositorFrameAck& frame_ack) override;
   bool DemandDrawSw(SkCanvas* canvas) override;
   void SetMemoryPolicy(size_t bytes_limit) override {}
   void DidChangeRootLayerScrollOffset(
       const gfx::ScrollOffset& root_offset) override {}
   void SetIsActive(bool is_active) override {}
+  void SynchronizeWithRenderer() override {}
   void OnComputeScroll(base::TimeTicks animate_time) override {}
 
   void SetHardwareFrame(uint32_t output_surface_id,
                         scoped_ptr<cc::CompositorFrame> frame);
 
   struct ReturnedResources {
     ReturnedResources();
     ~ReturnedResources();
 
     uint32_t output_surface_id;
     cc::ReturnedResourceArray resources;
   };
   using FrameAckArray = std::vector<ReturnedResources>;
   void SwapReturnedResources(FrameAckArray* array);
 
  private:
   SynchronousCompositorClient* client_;
   SynchronousCompositor::Frame hardware_frame_;
   FrameAckArray frame_ack_array_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSynchronousCompositor);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_TEST_SYNCHRONOUS_COMPOSITOR_ANDROID_H_