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

mojo/services/html_viewer/weblayertreeview_impl.cc

 // 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.
 
 #include "mojo/services/html_viewer/weblayertreeview_impl.h"
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "cc/blink/web_layer_impl.h"
 #include "cc/layers/layer.h"
 #include "cc/output/begin_frame_args.h"
@@ skipping 55 matching lines @@
   blink::WebBeginFrameArgs web_begin_frame_args(
       frame_time_sec, deadline_sec, interval_sec);
   widget_->beginFrame(web_begin_frame_args);
 }
 
 void WebLayerTreeViewImpl::Layout() {
   widget_->layout();
 }
 
 void WebLayerTreeViewImpl::ApplyViewportDeltas(
+    const gfx::Vector2d& inner_delta,
+    const gfx::Vector2d& outer_delta,
+    float page_scale,
+    float top_controls_delta) {
+  widget_->applyViewportDeltas(
+      inner_delta,
+      outer_delta,
+      page_scale,
+      top_controls_delta);
+}
+
+void WebLayerTreeViewImpl::ApplyViewportDeltas(
     const gfx::Vector2d& scroll_delta,
     float page_scale,
     float top_controls_delta) {
   widget_->applyViewportDeltas(scroll_delta, page_scale, top_controls_delta);
 }
 
 scoped_ptr<cc::OutputSurface> WebLayerTreeViewImpl::CreateOutputSurface(
     bool fallback) {
   return output_surface_.Pass();
 }
@@ skipping 137 matching lines @@
       base::Bind(&WebLayerTreeViewImpl::DidCreateSurfaceOnMainThread,
                  main_thread_bound_weak_ptr_,
                  id));
 }
 
 void WebLayerTreeViewImpl::DidCreateSurfaceOnMainThread(cc::SurfaceId id) {
   view_->SetSurfaceId(SurfaceId::From(id));
 }
 
 }  // namespace mojo