Makes the browser send pixels to the GPU process where it should

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 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/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 528 matching lines @@
   if (command_line.HasSwitch(switches::kDefaultTileHeight))
     prefs.default_tile_height =
         GetSwitchValueAsInt(command_line, switches::kDefaultTileHeight, 1);
   if (command_line.HasSwitch(switches::kMaxUntiledLayerWidth))
     prefs.max_untiled_layer_width =
         GetSwitchValueAsInt(command_line, switches::kMaxUntiledLayerWidth, 1);
   if (command_line.HasSwitch(switches::kMaxUntiledLayerHeight))
     prefs.max_untiled_layer_height =
         GetSwitchValueAsInt(command_line, switches::kMaxUntiledLayerHeight, 1);
 
+  if (gfx::Screen::IsDIPEnabled()) {
+    // Only apply when using DIP coordinate system as this setting interferes
+    // with fixed layout mode.
+    prefs.apply_default_device_scale_factor_in_compositor = true;
+  }
+
   content::GetContentClient()->browser()->OverrideWebkitPrefs(rvh, url, &prefs);
 
   return prefs;
 }
 
 NavigationControllerImpl& WebContentsImpl::GetControllerImpl() {
   return controller_;
 }
 
 RenderViewHostManager* WebContentsImpl::GetRenderManagerForTesting() {
@@ skipping 2251 matching lines @@
 void WebContentsImpl::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = GetView()->CreateViewForWidget(rvh);
   // Can be NULL during tests.
   if (rwh_view)
     rwh_view->SetSize(GetView()->GetContainerSize());
 }
 
 RenderViewHostImpl* WebContentsImpl::GetRenderViewHostImpl() {
   return static_cast<RenderViewHostImpl*>(GetRenderViewHost());
 }