[blimp] Add support for having multiple tabs

blimp/engine/session/tab.h

 // Copyright 2016 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_TAB_H_
 #define BLIMP_ENGINE_SESSION_TAB_H_
 
 #include "base/macros.h"
+#include "blimp/engine/feature/engine_render_widget_feature.h"
 #include "blimp/engine/session/page_load_tracker.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 class RenderViewHost;
 class WebContents;
 }
 
 namespace blimp {
 
 class BlimpMessageProcessor;
 
 namespace engine {
 
 class EngineRenderWidgetFeature;
 
 // Owns WebContents, handles operations such as navigation requests in the tab,
 // and has one-to-one mapping to a client tab.
-class Tab : public content::WebContentsObserver, public PageLoadTrackerClient {
+class Tab : public content::WebContentsObserver,
+            public PageLoadTrackerClient,
+            public EngineRenderWidgetFeature::RenderWidgetMessageDelegate {
  public:
   // Caller ensures |render_widget_feature| and |navigation_message_sender|
   // outlives this object.
   // |web_contents|: the WebContents this tab owns.
   // |tab_id|: the ID of this tab.
   // |render_widget_feature|: render widget feature.
   // |navigation_message_sender|: for sending navigation messages to client.
   Tab(std::unique_ptr<content::WebContents> web_contents,
       const int tab_id,
       EngineRenderWidgetFeature* render_widget_feature,
@@ skipping 11 matching lines @@
   void GoBack();
   void GoForward();
   void Reload();
 
   // Handles navigation state changed event.
   void NavigationStateChanged(content::InvalidateTypes changed_flags);
 
   // PageLoadTrackerClient implementation.
   void SendPageLoadStatusUpdate(PageLoadStatus load_status) override;
 
+  // RenderWidgetMessage handler methods.
+  // RenderWidgetMessageDelegate implementation.
+  void OnWebGestureEvent(
+      content::RenderWidgetHost* render_widget_host,
+      std::unique_ptr<blink::WebGestureEvent> event) override;
+  void OnCompositorMessageReceived(
+      content::RenderWidgetHost* render_widget_host,
+      const std::vector<uint8_t>& message) override;
+
  private:
   // content::WebContentsObserver implementation.
   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
   void RenderViewHostChanged(content::RenderViewHost* old_host,
                              content::RenderViewHost* new_host) override;
   void RenderViewDeleted(content::RenderViewHost* render_view_host) override;
 
   std::unique_ptr<content::WebContents> web_contents_;
   const int tab_id_;
   EngineRenderWidgetFeature* render_widget_feature_;
   BlimpMessageProcessor* navigation_message_sender_;
 
   // Tracks the page load status for a tab.
   PageLoadTracker page_load_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(Tab);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_SESSION_TAB_H_