Create MediaRouterActionController and MediaRouterUIService

chrome/browser/extensions/component_migration_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_COMPONENT_MIGRATION_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_COMPONENT_MIGRATION_HELPER_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 89 matching lines @@
   // extension loading.
   void OnFeatureDisabled(const std::string& component_action_id);
 
   // Call when the user manually removes the component action from the toolbar.
   void OnActionRemoved(const std::string& component_action_id);
 
   // extensions::ExtensionRegistryObserver:
   void OnExtensionReady(content::BrowserContext* browser_context,
                         const Extension* extension) override;
 
- protected:
-  // Protected for unit testing.
+  // Gets and sets the preference for whether to put the component action with
+  // the given ID on the toolbar (or in the overflow menu).
+  bool GetComponentActionPref(const std::string& component_action_id) const;
   void SetComponentActionPref(const std::string& component_action_id,

[imcheng, 2016/09/13 23:13:09]

Why is SetComponentActionPref public? I don't see any new callsites introduced
in this patch?

[takumif, 2016/09/14 04:00:51]

It's for MRAction to call, which is in the other patch.

                               bool enabled);
 
+ protected:
   // A set of component action ids whose features are currently enabled.
   // Protected for unit testing.
   std::set<std::string> enabled_actions_;
 
  private:
   bool IsExtensionInstalledAndEnabled(const ExtensionId& extension_id) const;
   void UnloadExtension(const ExtensionId& extension_id);
   void RemoveComponentActionPref(const std::string& component_action_id);
   std::vector<std::string> GetExtensionIdsForActionId(
       const std::string& component_action_id) const;
@@ skipping 11 matching lines @@
 
   // A list of pairs of component action ids and extension ids.
   std::vector<std::pair<std::string, ExtensionId>> migrated_actions_;
 
   DISALLOW_COPY_AND_ASSIGN(ComponentMigrationHelper);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_COMPONENT_MIGRATION_HELPER_H_