[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/web/DevToolsEmulator.cpp

 // Copyright 2015 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 "web/DevToolsEmulator.h"
 
 #include "core/exported/WebViewBase.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/frame/VisualViewport.h"
@@ skipping 302 matching lines @@
   // we end up with enabling emulation in this case.
   if (web_view_impl_->MainFrameImpl())
     web_view_impl_->MainFrameImpl()->GetFrameView()->UpdateLayout();
 }
 
 void DevToolsEmulator::DisableMobileEmulation() {
   if (!emulate_mobile_enabled_)
     return;
   RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(
       is_overlay_scrollbars_enabled_);
-  RuntimeEnabledFeatures::setOrientationEventEnabled(
-      is_orientation_event_enabled_);

[Yuki, 2017/05/12 15:20:11]

You can do this in a separate CL.

[peria, 2017/05/30 08:25:43]

reverted.

   RuntimeEnabledFeatures::setMobileLayoutThemeEnabled(
       is_mobile_layout_theme_enabled_);
   ComputedStyle::InvalidateInitialStyle();
   web_view_impl_->GetPage()->GetSettings().SetViewportEnabled(false);
   web_view_impl_->GetPage()->GetSettings().SetViewportMetaEnabled(false);
   web_view_impl_->GetPage()->GetVisualViewport().InitializeScrollbars();
   web_view_impl_->GetSettings()->SetShrinksViewportContentToFit(false);
   web_view_impl_->GetPage()->GetSettings().SetTextAutosizingEnabled(
       embedder_text_autosizing_enabled_);
   web_view_impl_->GetPage()->GetSettings().SetPreferCompositingToLCDTextEnabled(
@@ skipping 216 matching lines @@
       last_pinch_anchor_css_.reset();
       last_pinch_anchor_dip_.reset();
     }
     return true;
   }
 
   return false;
 }
 
 }  // namespace blink