Implement sidebar support for extension action popups

extensions/browser/extension_host.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_EXTENSION_HOST_H_
 #define EXTENSIONS_BROWSER_EXTENSION_HOST_H_
 
 #include <set>
 #include <string>
 
@@ skipping 121 matching lines @@
                            UnloadedExtensionInfo::Reason reason) override;
 
  protected:
   // Called each time this ExtensionHost completes a load finishes loading,
   // before any stop-loading notifications or observer methods are called.
   virtual void OnDidStopFirstLoad();
 
   // Navigates to the initial page.
   virtual void LoadInitialURL();
 
+  // Navigates to the page.
+  virtual void LoadURL(const GURL& url);

[Devlin, 2015/06/16 17:56:12]

When is this used?

+
   // Returns true if we're hosting a background page.
   virtual bool IsBackgroundPage() const;
 
  private:
   // DeferredStartRenderHost:
   void CreateRenderViewNow() override;
   void AddDeferredStartRenderHostObserver(
       DeferredStartRenderHostObserver* observer) override;
   void RemoveDeferredStartRenderHostObserver(
       DeferredStartRenderHostObserver* observer) override;
@@ skipping 60 matching lines @@
   base::ObserverList<ExtensionHostObserver> observer_list_;
   base::ObserverList<DeferredStartRenderHostObserver>
       deferred_start_render_host_observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_HOST_H_