cc/blimp: Add synchronization for scroll/scale state.

blimp/engine/app/settings_manager.cc

 // Copyright 2016 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 <blimp/engine/app/settings_manager.h>
 #include "content/public/browser/render_view_host.h"
 #include "content/public/common/web_preferences.h"
 
 namespace blimp {
 namespace engine {
@@ skipping 13 matching lines @@
 void SettingsManager::UpdateWebkitPreferences(content::WebPreferences* prefs) {
   prefs->record_whole_document = settings_.record_whole_document;
   prefs->animation_policy = settings_.animation_policy;
   prefs->viewport_meta_enabled = settings_.viewport_meta_enabled;
   prefs->default_minimum_page_scale_factor =
       settings_.default_minimum_page_scale_factor;
   prefs->default_maximum_page_scale_factor =
       settings_.default_maximum_page_scale_factor;
   prefs->shrinks_viewport_contents_to_fit =
       settings_.shrinks_viewport_contents_to_fit;
+  prefs->use_solid_color_scrollbars = true;
 }
 
 const EngineSettings& SettingsManager::GetEngineSettings() const {
   return settings_;
 }
 
 void SettingsManager::UpdateEngineSettings(const EngineSettings& settings) {
   EngineSettings old_settings = settings_;
   settings_ = settings;
 
   if (settings_.record_whole_document != old_settings.record_whole_document) {
     // Notify the observers that the web preferences have changed.
     for (auto& observer : observer_list_)
       observer.OnWebPreferencesChanged();
   }
 }
 
 }  // namespace engine
 }  // namespace blimp