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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_
      6 #define CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "gin/wrappable.h"
     10 
     11 namespace blink {
     12 class WebFrame;
     13 }
     14 
     15 namespace content {
     16 
     17 // This class is exposed in JS as window.statsCollectionController and provides
     18 // functionality to read out statistics from the browser.
     19 // Its use must be enabled specifically via the
     20 // --enable-stats-collection-bindings command line flag.
     21 class StatsCollectionController
     22     : public gin::Wrappable<StatsCollectionController> {
     23  public:
     24   static gin::WrapperInfo kWrapperInfo;
     25 
     26   static void Install(blink::WebFrame* frame);
     27 
     28  private:
     29   StatsCollectionController();
     30   virtual ~StatsCollectionController();
     31 
     32   // Retrieves a histogram and returns a JSON representation of it.
     33   std::string GetHistogram(const std::string& histogram_name);
     34 
     35   // Retrieves a histogram from the browser process and returns a JSON
     36   // representation of it.
     37   std::string GetBrowserHistogram(const std::string& histogram_name);
     38 
     39   // Returns JSON representation of tab timing information for the current tab.
     40   std::string GetTabLoadTiming();
     41 
     42   DISALLOW_COPY_AND_ASSIGN(StatsCollectionController);
     43 };
     44 
     45 }  // namespace content
     46 
     47 #endif  // CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_
     48