customtabs: Send time to first contentful paint to the caller.

chrome/browser/page_load_metrics/observers/android_page_load_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/android_page_load_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/android_page_load_metrics_observer.h b/chrome/browser/page_load_metrics/observers/android_page_load_metrics_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..4e65b434d566bb85e76bdcbb08a93d32bc7c7d4e
--- /dev/null
+++ b/chrome/browser/page_load_metrics/observers/android_page_load_metrics_observer.h
@@ -0,0 +1,39 @@
+// Copyright 2016 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 CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_ANDROID_PAGE_LOAD_METRICS_OBSERVER_H_
+#define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_ANDROID_PAGE_LOAD_METRICS_OBSERVER_H_
+
+#include <jni.h>
+
+#include "base/macros.h"
+#include "components/page_load_metrics/browser/page_load_metrics_observer.h"

[Bryan McQuade, 2016/07/26 23:44:27]

i just moved page_load_metrics out of components in
https://codereview.chromium.org/2177743002, so this include path should now be
chrome/browser/page_load_metrics/page_load_metrics_observer.h

[Benoit L, 2016/07/27 16:23:45]

Thanks for pointing that out!
Done.

+
+namespace content {
+class WebContents;
+}  // namespace content
+
+class GURL;
+
+/** Forwards page load metrics to the Java side on Android. */
+class AndroidPageLoadMetricsObserver
+    : public page_load_metrics::PageLoadMetricsObserver {
+ public:
+  explicit AndroidPageLoadMetricsObserver(content::WebContents* web_contents);
+
+  // page_load_metrics::PageLoadMetricsObserver:
+  void OnFirstContentfulPaint(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& extra_info) override;
+
+ private:
+  content::WebContents* web_contents_;
+  bool has_seen_first_contentful_paint_;

[Bryan McQuade, 2016/07/26 14:29:33]

you can remove this now

[Benoit L, 2016/07/27 16:23:45]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(AndroidPageLoadMetricsObserver);
+};
+
+bool RegisterPageLoadMetricsBindings(JNIEnv* env);
+
+#endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_ANDROID_PAGE_LOAD_METRICS_OBSERVER_H_