Chromecast: adds callback for CastService to control metrics state.

chromecast/service/cast_service.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 CHROMECAST_SERVICE_CAST_SERVICE_H_
 #define CHROMECAST_SERVICE_CAST_SERVICE_H_
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace base {
 class ThreadChecker;
 }
 
 namespace content {
 class BrowserContext;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace chromecast {
 namespace shell {
 class CastNetworkDelegate;
 }
 
 class CastService {
  public:
+  // A callback that will be invoked when the user changes the opt-in stats
+  // value.
+  typedef base::Callback<void(bool)> OptInStatsChangedCallback;
+
   // Create() takes a separate url request context getter because the request
   // context getter obtained through the browser context might not be
   // appropriate for the url requests made by the cast service/reciever.
   // For example, on Chromecast, it is needed to pass in a system url request
   // context getter that would set the request context for NSS, which the main
   // getter doesn't do.
   static CastService* Create(
       content::BrowserContext* browser_context,
       net::URLRequestContextGetter* request_context_getter,
-      shell::CastNetworkDelegate* network_delegate);
+      shell::CastNetworkDelegate* network_delegate,
+      const OptInStatsChangedCallback& opt_in_stats_callback);
 
   virtual ~CastService();
 
   // Start/stop the cast service.
   void Start();
   void Stop();
 
  protected:
-  explicit CastService(content::BrowserContext* browser_context);
+  CastService(content::BrowserContext* browser_context,
+              const OptInStatsChangedCallback& opt_in_stats_callback);
   virtual void Initialize() = 0;
 
   // Implementation-specific start/stop behavior.
   virtual void StartInternal() = 0;
   virtual void StopInternal() = 0;
 
   content::BrowserContext* browser_context() const { return browser_context_; }
+  const OptInStatsChangedCallback& opt_in_stats_callback() const {
+    return opt_in_stats_callback_;
+  }
 
  private:
   content::BrowserContext* const browser_context_;
+  const OptInStatsChangedCallback opt_in_stats_callback_;
   bool stopped_;
-
   const scoped_ptr<base::ThreadChecker> thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(CastService);
 };
 
 }  // namespace chromecast
 
 #endif  // CHROMECAST_SERVICE_CAST_SERVICE_H_