Create and integrate a metrics service client into Blimp engine.

blimp/engine/session/blimp_engine_session.h

 // Copyright 2015 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 BLIMP_ENGINE_SESSION_BLIMP_ENGINE_SESSION_H_
 #define BLIMP_ENGINE_SESSION_BLIMP_ENGINE_SESSION_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 66 matching lines @@
   BlimpEngineSession(std::unique_ptr<BlimpBrowserContext> browser_context,
                      net::NetLog* net_log,
                      BlimpEngineConfig* config,
                      SettingsManager* settings_manager);
   ~BlimpEngineSession() override;
 
   // Starts the network stack on the IO thread, and sets default placeholder
   // values for e.g. screen size pending real values being supplied by the
   // client.
   void Initialize();
+  // Finalizes the metrics reporting client.
+  void Finalize();
 
   BlimpBrowserContext* browser_context() { return browser_context_.get(); }
 
   // BlimpMessageProcessor implementation.
   // This object handles incoming TAB_CONTROL and NAVIGATION messages directly.
   void ProcessMessage(std::unique_ptr<BlimpMessage> message,
                       const net::CompletionCallback& callback) override;
 
  private:
   // Creates ThreadPipeManager, registers features, and then starts to accept
@@ skipping 116 matching lines @@
   std::unique_ptr<BlimpMessageProcessor> tab_control_message_sender_;
   std::unique_ptr<BlimpMessageProcessor> navigation_message_sender_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpEngineSession);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_SESSION_BLIMP_ENGINE_SESSION_H_