Always enable Slimming Paint.

content/public/common/web_preferences.cc

 // 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.
 
 #include "content/public/common/web_preferences.h"
 
 #include "base/basictypes.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/web/WebSettings.h"
@@ skipping 172 matching lines @@
       smart_insert_delete_enabled(true),
 #else
       smart_insert_delete_enabled(false),
 #endif
       spatial_navigation_enabled(false),
       pinch_virtual_viewport_enabled(false),
       pinch_overlay_scrollbar_thickness(0),
       use_solid_color_scrollbars(false),
       navigate_on_drag_drop(true),
       v8_cache_options(V8_CACHE_OPTIONS_DEFAULT),
-      slimming_paint_enabled(false),
+      slimming_paint_enabled(true),
       cookie_enabled(true),
       pepper_accelerated_video_decode_enabled(false),
       animation_policy(IMAGE_ANIMATION_POLICY_ALLOWED),
 #if defined(OS_ANDROID)
       text_autosizing_enabled(true),
       font_scale_factor(1.0f),
       device_scale_adjustment(1.0f),
       force_enable_zoom(false),
       fullscreen_supported(true),
       double_tap_to_zoom_enabled(true),
@@ skipping 27 matching lines @@
   cursive_font_family_map[kCommonScript] = base::ASCIIToUTF16("Script");
   fantasy_font_family_map[kCommonScript] = base::ASCIIToUTF16("Impact");
   pictograph_font_family_map[kCommonScript] =
       base::ASCIIToUTF16("Times New Roman");
 }
 
 WebPreferences::~WebPreferences() {
 }
 
 }  // namespace content