[blimp] Add support for having multiple tabs

blimp/client/core/contents/blimp_contents_manager.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_CLIENT_CORE_CONTENTS_BLIMP_CONTENTS_MANAGER_H_
 #define BLIMP_CLIENT_CORE_CONTENTS_BLIMP_CONTENTS_MANAGER_H_
 
 #include <map>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 44 matching lines @@
   // pointer to the manager. The contents pointer is used to retrieve its id,
   // which in turn is used to destroy the observer entry from the observer_map_
   // and close the tab.
   void OnContentsDestroyed(BlimpContents* contents);
 
   // Destroy the observer entry from the observer_map_ when a BlimpContentsImpl
   // is destroyed.
   void EraseObserverFromMap(int id);
   base::WeakPtr<BlimpContentsManager> GetWeakPtr();
 
+  // The ID to use whenever a new BlimpContentsImpl is created. Incremented
+  // after each use.
+  int next_blimp_contents_id_ = 0;
+
   // BlimpContentsManager owns the BlimpContentsDeletionObserver for the
   // contents it creates, with the content id being the key to help manage the
   // lifetime of the observers.
   std::map<int, std::unique_ptr<BlimpContentsDeletionObserver>> observer_map_;
 
   BlimpCompositorDependencies* blimp_compositor_dependencies_;
   ImeFeature* ime_feature_;
   NavigationFeature* navigation_feature_;
   RenderWidgetFeature* render_widget_feature_;
   TabControlFeature* tab_control_feature_;
 
   // TODO(mlliu): Currently we want to have a single BlimpContents. Remove this
   // when it supports multiple tabs (http://crbug.com/642558).
   bool tab_exists_ = false;
 
   base::WeakPtrFactory<BlimpContentsManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpContentsManager);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_CORE_CONTENTS_BLIMP_CONTENTS_MANAGER_H_