Implementation of device metrics emulation in render view.

content/renderer/web_preferences.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/public/renderer/web_preferences.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/WebKit/public/web/WebKit.h"
@@ skipping 329 matching lines @@
   settings->setUseLegacyBackgroundSizeShorthandBehavior(
       prefs.use_legacy_background_size_shorthand_behavior);
   settings->setWideViewportQuirkEnabled(prefs.wide_viewport_quirk);
   settings->setUseWideViewport(prefs.use_wide_viewport);
   settings->setViewportMetaLayoutSizeQuirk(
       prefs.viewport_meta_layout_size_quirk);
   settings->setViewportMetaZeroValuesQuirk(
       prefs.viewport_meta_zero_values_quirk);
   settings->setIgnoreMainFrameOverflowHiddenQuirk(
       prefs.ignore_main_frame_overflow_hidden_quirk);
+  settings->setRootLayerClipsContent(false);

[aelias_OOO_until_Jul13, 2013/10/01 08:08:22]

Let's call this setMainFrameClipsContent since it's actually the "container
layer" (first child of the root layer) that clips.

[dgozman, 2013/10/01 15:26:10]

Done.

 #endif
 
   WebNetworkStateNotifier::setOnLine(prefs.is_online);
   settings->setExperimentalWebSocketEnabled(
       prefs.experimental_websocket_enabled);
   settings->setPinchVirtualViewportEnabled(
       prefs.pinch_virtual_viewport_enabled);
 
   settings->setPinchOverlayScrollbarThickness(
       prefs.pinch_overlay_scrollbar_thickness);
   settings->setUseSolidColorScrollbars(prefs.use_solid_color_scrollbars);
 }
 
 }  // namespace content