Add stats collection for telemetry startup.warm.blank_page test.

components/html_viewer/stats_collection_controller.cc

Index: components/html_viewer/stats_collection_controller.cc
diff --git a/components/html_viewer/stats_collection_controller.cc b/components/html_viewer/stats_collection_controller.cc
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+++ b/components/html_viewer/stats_collection_controller.cc
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+// Copyright 2015 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.
+
+#include "components/html_viewer/stats_collection_controller.h"
+
+#include "base/command_line.h"
+#include "base/json/json_writer.h"
+#include "base/metrics/histogram.h"
+#include "base/metrics/statistics_recorder.h"
+#include "base/run_loop.h"
+#include "base/strings/string_util.h"
+#include "base/values.h"
+#include "components/html_viewer/html_document.h"
+#include "components/startup_metric_utils/startup_metric_utils.h"
+#include "gin/handle.h"
+#include "gin/object_template_builder.h"
+#include "mojo/application/public/cpp/application_impl.h"
+#include "mojo/runner/switches.h"
+#include "third_party/WebKit/public/web/WebKit.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/WebKit/public/web/WebView.h"
+
+namespace html_viewer {
+
+namespace {
+
+// Initialize the histogram data using the given startup performance times.
+// TODO(msw): Have mojo:tracing record the histograms and serve their JSON?
+void GetStartupPerformanceTimesCallbackImpl(
+    const base::Closure& callback,
+    tracing::StartupPerformanceTimesPtr times) {
+  base::StatisticsRecorder::Initialize();
+
+  const base::Time shell_process_creation_time =
+      base::Time::FromInternalValue(times->shell_process_creation_time);
+  startup_metric_utils::RecordSavedMainEntryPointTime(
+      shell_process_creation_time);
+  // TODO(msw): Use |browser_message_loop_start_time|, instead of letting
+  //            OnBrowserStartupComplete incorrectly call base::Time::Now()...
+  startup_metric_utils::OnBrowserStartupComplete(false);
+
+  // TODO(msw): Consolidate with chrome's Browser::OnWindowDidShow()...
+  const base::Time browser_window_display_time =
+      base::Time::FromInternalValue(times->browser_window_display_time);
+  base::TimeDelta browser_window_display_delta =
+      browser_window_display_time - shell_process_creation_time;
+  UMA_HISTOGRAM_LONG_TIMES("Startup.BrowserWindowDisplay",
+                           browser_window_display_delta);
+
+  // TODO(msw): Consolidate with chrome's PreMainMessageLoopRunImpl()...
+  // TODO(msw): Need to measure the "browser_open_start" time for this delta...
+  const base::Time browser_open_tabs_time =
+      base::Time::FromInternalValue(times->browser_open_tabs_time);
+  base::TimeDelta browser_open_tabs_delta =
+      browser_open_tabs_time - shell_process_creation_time;
+  UMA_HISTOGRAM_LONG_TIMES_100("Startup.BrowserOpenTabs",
+                               browser_open_tabs_delta);
+
+  // TODO(msw): Consolidate with chrome's first_web_contents_profiler.cc...
+  const base::Time first_web_contents_main_frame_load_time =
+      base::Time::FromInternalValue(
+          times->first_web_contents_main_frame_load_time);
+  base::TimeDelta first_web_contents_main_frame_load_delta =
+      first_web_contents_main_frame_load_time - shell_process_creation_time;
+  UMA_HISTOGRAM_LONG_TIMES_100("Startup.FirstWebContents.MainFrameLoad",
+                               first_web_contents_main_frame_load_delta);
+
+  // TODO(msw): Consolidate with chrome's first_web_contents_profiler.cc...
+  const base::Time first_visually_non_empty_layout_time =
+      base::Time::FromInternalValue(
+          times->first_visually_non_empty_layout_time);
+  base::TimeDelta first_web_contents_non_empty_paint_delta =
+      first_visually_non_empty_layout_time - shell_process_creation_time;
+  UMA_HISTOGRAM_LONG_TIMES_100("Startup.FirstWebContents.NonEmptyPaint",
+                               first_web_contents_non_empty_paint_delta);
+
+  callback.Run();
+}
+
+// Encodes a WebContentsLoadTime as JSON.
+// Input:
+// - |load_start_time| - time at which page load started.
+// - |load_stop_time| - time at which page load stopped.
+// - |result| - returned JSON.
+// Example return value:
+// {'load_start_ms': 1, 'load_duration_ms': 2.5}
+// either value may be null if a web contents hasn't fully loaded.
+// load_start_ms is represented as milliseconds since the unix epoch.
+// TODO(msw): Consolidate with content/renderer/stats_collection_controller.cc.
+void ConvertLoadTimeToJSON(const base::Time& load_start_time,
+                           const base::Time& load_stop_time,
+                           std::string* result) {
+  base::DictionaryValue item;
+
+  if (load_start_time.is_null()) {
+    item.Set("load_start_ms", base::Value::CreateNullValue());
+  } else {
+    item.SetDouble("load_start_ms", (load_start_time - base::Time::UnixEpoch())
+                                        .InMillisecondsF());
+  }
+  if (load_start_time.is_null() || load_stop_time.is_null()) {
+    item.Set("load_duration_ms", base::Value::CreateNullValue());
+  } else {
+    item.SetDouble("load_duration_ms",
+                   (load_stop_time - load_start_time).InMillisecondsF());
+  }
+  base::JSONWriter::Write(item, result);
+}
+
+}  // namespace
+
+// static
+gin::WrapperInfo StatsCollectionController::kWrapperInfo = {
+    gin::kEmbedderNativeGin};
+
+// static
+StatsCollectionController* StatsCollectionController::Install(
+    HTMLDocument* html_document,
+    mojo::ApplicationImpl* app) {
+  // Only make startup tracing available when running in the context of a test.
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kStatsCollectionController)) {
+    return nullptr;
+  }
+
+  blink::WebFrame* frame = html_document->web_view()->mainFrame();
+  v8::Isolate* isolate = blink::mainThreadIsolate();
+  v8::HandleScope handle_scope(isolate);
+  v8::Local<v8::Context> context = frame->mainWorldScriptContext();
+  if (context.IsEmpty())
+    return nullptr;
+
+  v8::Context::Scope context_scope(context);
+
+  StatsCollectionController* stats_collection_controller =
+      new StatsCollectionController(html_document, app);
+  gin::Handle<StatsCollectionController> controller =
+      gin::CreateHandle(isolate, stats_collection_controller);
+  if (controller.IsEmpty())
+    return nullptr;
+  v8::Local<v8::Object> global = context->Global();
+  global->Set(gin::StringToV8(isolate, "statsCollectionController"),
+              controller.ToV8());
+  return stats_collection_controller;
+}
+
+void StatsCollectionController::DidHandleOnloadEvents(const base::Time& time) {
+  startup_performance_controller_->SetFirstWebContentsMainFrameLoadTime(
+      time.ToInternalValue());
+}
+
+void StatsCollectionController::DidFirstVisuallyNonEmptyLayout(
+    const base::Time& time) {
+  startup_performance_controller_->SetFirstVisuallyNonEmptyLayoutTime(
+      time.ToInternalValue());
+}
+
+StatsCollectionController::StatsCollectionController(
+    HTMLDocument* html_document,
+    mojo::ApplicationImpl* app)
+    : observer_(html_document) {
+  mojo::URLRequestPtr request(mojo::URLRequest::New());
+  request->url = mojo::String::From("mojo:tracing");
+  app->ConnectToService(request.Pass(), &startup_performance_controller_);
+}
+
+StatsCollectionController::~StatsCollectionController() {}
+
+gin::ObjectTemplateBuilder StatsCollectionController::GetObjectTemplateBuilder(
+    v8::Isolate* isolate) {
+  return gin::Wrappable<StatsCollectionController>::GetObjectTemplateBuilder(
+             isolate)
+      .SetMethod("getHistogram", &StatsCollectionController::GetHistogram)
+      .SetMethod("getBrowserHistogram",
+                 &StatsCollectionController::GetBrowserHistogram)
+      .SetMethod("tabLoadTiming", &StatsCollectionController::GetTabLoadTiming);
+}
+
+std::string StatsCollectionController::GetHistogram(
+    const std::string& histogram_name) {
+  DCHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kStatsCollectionController));
+
+  // TODO(msw): Use a more robust check for startup histogram init.
+  if (!base::StatisticsRecorder::IsActive()) {
+    // Get the startup performance times from the tracing service.
+    // TODO(msw): Have mojo:tracing provide the histogram JSON?
+    base::RunLoop run_loop;
+    auto callback = base::Bind(&GetStartupPerformanceTimesCallbackImpl,
+                               run_loop.QuitClosure());
+    startup_performance_controller_->GetStartupPerformanceTimes(callback);
+    run_loop.Run();

[yzshen1, 2015/08/13 15:59:12]

Maybe consider using InterfacePtr<>::WaitForIncomingResponse()?

[msw, 2015/08/14 23:20:34]

Done.

+    DCHECK(base::StatisticsRecorder::IsActive());
+  }
+
+  std::string histogram_json = "{}";
+  base::HistogramBase* histogram =
+      base::StatisticsRecorder::FindHistogram(histogram_name);
+  if (histogram)
+    histogram->WriteJSON(&histogram_json);
+  // TODO(msw): Remove debug printing...
+  LOG(ERROR) << "MSW Histogram [" << histogram_name << "]: " << histogram_json;
+  return histogram_json;
+}
+
+std::string StatsCollectionController::GetBrowserHistogram(
+    const std::string& histogram_name) {
+  // TODO(msw): Should GetHistogram/GetBrowserHistogram return distinct values?
+  return GetHistogram(histogram_name);
+}
+
+std::string StatsCollectionController::GetTabLoadTiming() {
+  std::string tab_timing_json = "{}";
+  ConvertLoadTimeToJSON(observer_.load_start_time(), observer_.load_stop_time(),
+                        &tab_timing_json);
+  return tab_timing_json;
+}
+
+}  // namespace html_viewer