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

content/test/web_layer_tree_view_impl_for_testing.cc

 // Copyright 2013 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.
 
 #include "content/test/web_layer_tree_view_impl_for_testing.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/lock.h"
 #include "cc/base/switches.h"
@@ skipping 120 matching lines @@
 }
 
 void WebLayerTreeViewImplForTesting::setDeferCommits(bool defer_commits) {
   layer_tree_host_->SetDeferCommits(defer_commits);
 }
 
 void WebLayerTreeViewImplForTesting::Layout() {
 }
 
 void WebLayerTreeViewImplForTesting::ApplyViewportDeltas(
+    const gfx::Vector2d& inner_delta,
+    const gfx::Vector2d& outer_delta,
+    float page_scale,
+    float top_controls_delta) {}
+
+void WebLayerTreeViewImplForTesting::ApplyViewportDeltas(
     const gfx::Vector2d& scroll_delta,
     float page_scale,
     float top_controls_delta) {}
 
 scoped_ptr<cc::OutputSurface>
 WebLayerTreeViewImplForTesting::CreateOutputSurface(bool fallback) {
   return make_scoped_ptr(
       new cc::OutputSurface(cc::TestContextProvider::Create()));
 }
 
@@ skipping 20 matching lines @@
 
 void WebLayerTreeViewImplForTesting::registerSelection(
     const blink::WebSelectionBound& start,
     const blink::WebSelectionBound& end) {
 }
 
 void WebLayerTreeViewImplForTesting::clearSelection() {
 }
 
 }  // namespace content