Adds DevTools commands for forced viewport override.

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 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/renderer/gpu/render_widget_compositor.h"
 
 #include <stddef.h>
 #include <limits>
 #include <string>
 #include <utility>
@@ skipping 682 matching lines @@
       layer_tree_host_->GetLayerTree()->animation_host();
   DCHECK(animation_host);
   animation_host->RemoveAnimationTimeline(compositor_timeline);
 }
 
 void RenderWidgetCompositor::setViewportSize(
     const WebSize& device_viewport_size) {
   layer_tree_host_->GetLayerTree()->SetViewportSize(device_viewport_size);
 }
 
+WebSize RenderWidgetCompositor::getViewportSize() const {
+  return layer_tree_host_->GetLayerTree()->device_viewport_size();
+}
+
 WebFloatPoint RenderWidgetCompositor::adjustEventPointForPinchZoom(
     const WebFloatPoint& point) const {
   return point;
 }
 
 void RenderWidgetCompositor::setDeviceScaleFactor(float device_scale) {
   layer_tree_host_->GetLayerTree()->SetDeviceScaleFactor(device_scale);
 }
 
 void RenderWidgetCompositor::setBackgroundColor(blink::WebColor color) {
@@ skipping 430 matching lines @@
 
   remote_proto_channel_receiver_->OnProtoReceived(std::move(deserialized));
 }
 
 void RenderWidgetCompositor::SetPaintedDeviceScaleFactor(
     float device_scale) {
   layer_tree_host_->GetLayerTree()->SetPaintedDeviceScaleFactor(device_scale);
 }
 
 }  // namespace content