[Blimp] Adds blimp engine browser test framework and LoadUrl test.

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 49 matching lines @@
 
 namespace engine {
 
 class BlimpBrowserContext;
 class BlimpEngineConfig;
 class BlimpFocusClient;
 class BlimpScreen;
 class BlimpWindowTreeHost;
 class EngineNetworkComponents;
 
+using GetPortCallback = base::Callback<void(uint16_t)>;
+
 class BlimpEngineSession
     : public BlimpMessageProcessor,
       public content::WebContentsDelegate,
       public content::WebContentsObserver,
       public ui::InputMethodObserver,
       public EngineRenderWidgetFeature::RenderWidgetMessageDelegate {
  public:
   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();
 
   BlimpBrowserContext* browser_context() { return browser_context_.get(); }
 
+  // Gets Engine's listening port. Invokes callback with the allocated port.
+  void GetEnginePortForTesting(const GetPortCallback& callback);
+
   // 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
   // incoming connection.
   void RegisterFeatures();
 
@@ skipping 113 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_