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

blimp/client/feature/render_widget_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_RENDER_WIDGET_FEATURE_H_
 #define BLIMP_CLIENT_FEATURE_RENDER_WIDGET_FEATURE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 24 matching lines @@
 // RenderWidget. This includes BlimpMessage::INPUT, BlimpMessage::COMPOSITOR,
 // and BlimpMessage::RENDER_WIDGET messages.  Delegates can be added to be
 // notified of incoming messages. This class automatically attaches a specific
 // id so that the engine can drop stale RenderWidget related messages after it
 // sends a RenderWidgetMessage::INITIALIZE message.
 class RenderWidgetFeature : public BlimpMessageProcessor {
  public:
   // A delegate to be notified of specific RenderWidget related incoming events.
   class RenderWidgetFeatureDelegate {
    public:
+    virtual ~RenderWidgetFeatureDelegate() {}
     virtual void OnRenderWidgetCreated(int render_widget_id) = 0;
 
     // Called when the engine's RenderWidget has changed for a particular
     // WebContents.  When this is received all state related to the existing
     // client RenderWidget should be reset.
     virtual void OnRenderWidgetInitialized(int render_widget_id) = 0;
 
     virtual void OnRenderWidgetDeleted(int render_widget_id) = 0;
 
     // Called when the engine sent a CompositorMessage.  These messages should
@@ skipping 61 matching lines @@
   // Used to send BlimpMessage::COMPOSITOR messages to the engine.
   std::unique_ptr<BlimpMessageProcessor> outgoing_compositor_message_processor_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetFeature);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_FEATURE_RENDER_WIDGET_FEATURE_H_