components/html_viewer/stats_collection_controller.h

   1 // Copyright 2015 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 COMPONENTS_HTML_VIEWER_STATS_COLLECTION_CONTROLLER_H_
   6 #define COMPONENTS_HTML_VIEWER_STATS_COLLECTION_CONTROLLER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "gin/wrappable.h"
  10 #include "mojo/services/tracing/public/interfaces/tracing.mojom.h"
  11
  12 namespace blink {
  13 class WebFrame;
  14 }
  15
  16 namespace mojo {
  17 class ApplicationImpl;
  18 }
  19
  20 namespace html_viewer {
  21
  22 // This class is exposed in JS as window.statsCollectionController and provides
  23 // functionality to read out statistics from the browser.
  24 // Its use must be enabled specifically via the
  25 // --enable-stats-collection-bindings command line flag.
  26 class StatsCollectionController
  27     : public gin::Wrappable<StatsCollectionController> {
  28  public:
  29   static gin::WrapperInfo kWrapperInfo;
  30
  31   // Install the JS and return a mojo:tracing InterfacePtr for stats reporting.
  32   // This bails and returns a null pointer without the command line flag.
  33   static tracing::StartupPerformanceDataCollectorPtr Install(
  34       blink::WebFrame* frame,
  35       mojo::ApplicationImpl* app);
  36
  37  private:
  38   explicit StatsCollectionController(
  39       tracing::StartupPerformanceDataCollectorPtr collector);
  40   ~StatsCollectionController() override;
  41
  42   // gin::WrappableBase
  43   gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
  44       v8::Isolate* isolate) override;
  45
  46   // Retrieves a histogram and returns a JSON representation of it.
  47   std::string GetHistogram(const std::string& histogram_name);
  48
  49   // Retrieves a browser histogram and returns a JSON representation of it.
  50   std::string GetBrowserHistogram(const std::string& histogram_name);
  51
  52   tracing::StartupPerformanceDataCollectorPtr
  53       startup_performance_data_collector_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(StatsCollectionController);
  56 };
  57
  58 }  // namespace html_viewer
  59
  60 #endif  // COMPONENTS_HTML_VIEWER_STATS_COLLECTION_CONTROLLER_H_