Plumbs through screen size and scale factor to html_viewer

components/native_viewport/platform_viewport_headless.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 "components/native_viewport/platform_viewport_headless.h"
 
 #include "mojo/converters/geometry/geometry_type_converters.h"
 
 namespace native_viewport {
 
 PlatformViewportHeadless::PlatformViewportHeadless(Delegate* delegate)
     : delegate_(delegate) {
 }
 
 PlatformViewportHeadless::~PlatformViewportHeadless() {
 }
 
 void PlatformViewportHeadless::Init(const gfx::Rect& bounds) {
   metrics_ = mojo::ViewportMetrics::New();
+  metrics_->device_pixel_ratio = 1.f;
   metrics_->size = mojo::Size::From(bounds.size());
 }
 
 void PlatformViewportHeadless::Show() {
 }
 
 void PlatformViewportHeadless::Hide() {
 }
 
 void PlatformViewportHeadless::Close() {
@@ skipping 10 matching lines @@
 }
 
 // static
 scoped_ptr<PlatformViewport> PlatformViewportHeadless::Create(
     Delegate* delegate) {
   return scoped_ptr<PlatformViewport>(
       new PlatformViewportHeadless(delegate)).Pass();
 }
 
 }  // namespace native_viewport