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

android_webview/browser/hardware_renderer.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 ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_H_
 
 #include "android_webview/browser/parent_compositor_draw_constraints.h"
 #include "android_webview/browser/shared_renderer_state.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 25 matching lines @@
   void DrawGL(bool stencil_enabled,
               int framebuffer_binding_ext,
               AwDrawGLInfo* draw_info);
   void CommitFrame();
 
   // cc::LayerTreeHostClient overrides.
   virtual void WillBeginMainFrame(int frame_id) OVERRIDE {}
   virtual void DidBeginMainFrame() OVERRIDE;
   virtual void BeginMainFrame(const cc::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<cc::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 {}
@@ skipping 38 matching lines @@
   ParentOutputSurface* output_surface_;
 
   ParentCompositorDrawConstraints draw_constraints_;
 
   DISALLOW_COPY_AND_ASSIGN(HardwareRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_H_