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

blimp/client/feature/navigation_feature.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_CLIENT_FEATURE_NAVIGATION_FEATURE_H_
 #define BLIMP_CLIENT_FEATURE_NAVIGATION_FEATURE_H_
 
 #include <map>
 #include <string>
 
 #include "base/containers/small_map.h"
 #include "base/macros.h"
 #include "blimp/net/blimp_message_processor.h"
 
 class GURL;
 class SkBitmap;
 
 namespace blimp {
 namespace client {
 
 // Handles all incoming and outgoing protobuf messages of type
 // RenderWidget::NAVIGATION.  Delegates can be added to be notified of incoming
 // messages.
 class NavigationFeature : public BlimpMessageProcessor {
  public:
   // A delegate to be notified of specific navigation events related to a
   // a particular tab.
   class NavigationFeatureDelegate {
    public:
+    virtual ~NavigationFeatureDelegate() {}
     virtual void OnUrlChanged(int tab_id, const GURL& url) = 0;
     virtual void OnFaviconChanged(int tab_id, const SkBitmap& favicon) = 0;
     virtual void OnTitleChanged(int tab_id, const std::string& title) = 0;
     virtual void OnLoadingChanged(int tab_id, bool loading) = 0;
     virtual void OnPageLoadStatusUpdate(int tab_id, bool completed) = 0;
   };
 
   NavigationFeature();
   ~NavigationFeature() override;
 
@@ skipping 26 matching lines @@
   // Used to send BlimpMessage::NAVIGATION messages to the engine.
   std::unique_ptr<BlimpMessageProcessor> outgoing_message_processor_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationFeature);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_FEATURE_NAVIGATION_FEATURE_H_