content/renderer/stats_collection_controller.h

   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   ~StatsCollectionController() override;
  31
  32   // gin::WrappableBase
  33   gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
  34       v8::Isolate* isolate) override;
  35
  36   // Retrieves a histogram and returns a JSON representation of it.
  37   std::string GetHistogram(const std::string& histogram_name);
  38
  39   // Retrieves a histogram from the browser process and returns a JSON
  40   // representation of it.
  41   std::string GetBrowserHistogram(const std::string& histogram_name);
  42
  43   // Returns JSON representation of tab timing information for the current tab.
  44   std::string GetTabLoadTiming();
  45
  46   DISALLOW_COPY_AND_ASSIGN(StatsCollectionController);
  47 };
  48
  49 }  // namespace content
  50
  51 #endif  // CONTENT_RENDERER_STATS_COLLECTION_CONTROLLER_H_