Revert of Delete the enable/disable layer squashing flags and settings.

content/public/common/web_preferences.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_PUBLIC_COMMON_WEB_PREFERENCES_H_
 #define CONTENT_PUBLIC_COMMON_WEB_PREFERENCES_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 99 matching lines @@
   bool webaudio_enabled;
   bool experimental_webgl_enabled;
   bool pepper_3d_enabled;
   bool flash_3d_enabled;
   bool flash_stage3d_enabled;
   bool flash_stage3d_baseline_enabled;
   bool gl_multisampling_enabled;
   bool privileged_webgl_extensions_enabled;
   bool webgl_errors_to_console_enabled;
   bool mock_scrollbars_enabled;
+  bool layer_squashing_enabled;
   bool asynchronous_spell_checking_enabled;
   bool unified_textchecker_enabled;
   bool accelerated_2d_canvas_enabled;
   int minimum_accelerated_2d_canvas_size;
   bool antialiased_2d_canvas_disabled;
   bool antialiased_clips_2d_canvas_enabled;
   int accelerated_2d_canvas_msaa_sample_count;
   bool accelerated_filters_enabled;
   bool deferred_filters_enabled;
   bool container_culling_enabled;
@@ skipping 77 matching lines @@
   // We try to keep the default values the same as the default values in
   // chrome, except for the cases where it would require lots of extra work for
   // the embedder to use the same default value.
   WebPreferences();
   ~WebPreferences();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_WEB_PREFERENCES_H_