PageLoadMetrics renderer and browser implementation (deprecated)

components/page_load_metrics/browser/page_load_metrics_web_contents_observer.h

+// 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.
+
+#ifndef COMPONENTS_PAGE_LOAD_METRICS_BROWSER_PAGE_LOAD_METRICS_WEB_CONTENTS_OBSERVER_H_
+#define COMPONENTS_PAGE_LOAD_METRICS_BROWSER_PAGE_LOAD_METRICS_WEB_CONTENTS_OBSERVER_H_
+
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+namespace content {
+class NavigationHandle;
+class RenderFrameHost;
+}  // namespace content
+
+namespace IPC {
+class Message;
+}  // namespace IPC
+
+namespace page_load_metrics {
+
+struct PageLoadTiming;
+
+// PageLoadMetricsWebContentsObserver logs page load UMA metrics based on
+// IPC messages received from a PageLoadMetricsRenderFrameObserver.
+class PageLoadMetricsWebContentsObserver
+    : public content::WebContentsObserver,
+      public content::WebContentsUserData<PageLoadMetricsWebContentsObserver> {
+ public:
+  ~PageLoadMetricsWebContentsObserver() override;
+
+  // WebContentsObserver implementation
+  bool OnMessageReceived(const IPC::Message& message,
+                         content::RenderFrameHost* render_frame_host) override;
+  // TODO: figure out which WebContentsObserver hooks to use to discover when
+  // a page navigation starts/finishes.

[nasko, 2015/08/26 17:27:24]

Look at
https://code.google.com/p/chromium/codesearch#chromium/src/content/public/bro...,
which is a new set of functions we just introduced that make tracking
navigations much easier. They should be self explanatory and if you have
specific questions, feel free to ping me.

[Bryan McQuade, 2015/08/26 18:28:00]

Thanks!

+
+ private:
+  explicit PageLoadMetricsWebContentsObserver(
+      content::WebContents* web_contents);
+  friend class content::WebContentsUserData<PageLoadMetricsWebContentsObserver>;
+  friend class PageLoadMetricsWebContentsObserverTest;
+
+  void OnTimingUpdated(const PageLoadTiming& timing);
+  void RecordTimingHistograms(const PageLoadTiming& timing);
+
+  DISALLOW_COPY_AND_ASSIGN(PageLoadMetricsWebContentsObserver);
+};
+
+}  // namespace page_load_metrics
+
+#endif  // COMPONENTS_PAGE_LOAD_METRICS_BROWSER_PAGE_LOAD_METRICS_WEB_CONTENTS_OBSERVER_H_