DevTools: request page thumbnails from the devtools handler delegate, do not redirect to chrome://t…

chrome/browser/debugger/browser_list_tabcontents_provider.h

 // Copyright (c) 2012 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 CHROME_BROWSER_DEBUGGER_BROWSER_LIST_TABCONTENTS_PROVIDER_H_
 #define CHROME_BROWSER_DEBUGGER_BROWSER_LIST_TABCONTENTS_PROVIDER_H_
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "content/public/browser/devtools_http_handler_delegate.h"
 
 namespace content {
 class WebContents;
 }
 
 class BrowserListTabContentsProvider
     : public content::DevToolsHttpHandlerDelegate {
  public:
   BrowserListTabContentsProvider();
   virtual ~BrowserListTabContentsProvider();
 
   // DevToolsHttpProtocolHandler::Delegate overrides.
   virtual std::string GetDiscoveryPageHTML() OVERRIDE;
   virtual bool BundlesFrontendResources() OVERRIDE;
   virtual std::string GetFrontendResourcesBaseURL() OVERRIDE;
+  virtual std::string GetPageThumbnailData(const GURL& url) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserListTabContentsProvider);
 };
 
 #endif  // CHROME_BROWSER_DEBUGGER_BROWSER_LIST_TABCONTENTS_PROVIDER_H_