[Page Load Metrics] Add page load metrics for omnibox.

chrome/browser/page_load_metrics/observers/omnibox_suggestion_used_page_load_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/omnibox_suggestion_used_page_load_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/omnibox_suggestion_used_page_load_metrics_observer.h b/chrome/browser/page_load_metrics/observers/omnibox_suggestion_used_page_load_metrics_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..fa49ad49a89806354620fece1f732be5841638a3
--- /dev/null
+++ b/chrome/browser/page_load_metrics/observers/omnibox_suggestion_used_page_load_metrics_observer.h
@@ -0,0 +1,37 @@
+// Copyright 2017 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_OMNIBOX_SUGGESTION_USED_PAGE_LOAD_METRICS_OBSERVER_H_
+#define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_OMNIBOX_SUGGESTION_USED_PAGE_LOAD_METRICS_OBSERVER_H_
+
+#include "base/macros.h"
+#include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
+#include "ui/base/page_transition_types.h"
+
+class OmniboxSuggestionUsedMetricsObserver
+    : public page_load_metrics::PageLoadMetricsObserver {
+ public:
+  explicit OmniboxSuggestionUsedMetricsObserver(bool is_prerender);

[Mark P, 2017/03/29 23:17:07]

Please comment. It took me a lot of code browsing to convince myself that this
is whether a particular page load came from prerender.  My first glance at the
call to the constructor for this class, which uses IsPrerendering(), made me
think it's a question of whether the browser can be prerendering, not whether
this particular page load is.

[lpy, 2017/03/31 20:42:03]

Done.

+  ~OmniboxSuggestionUsedMetricsObserver() override;
+
+  // page_load_metrics::PageLoadMetricsObserver:
+  ObservePolicy OnHidden(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& info) override;
+  ObservePolicy OnCommit(content::NavigationHandle* navigation_handle) override;
+  void OnFirstContentfulPaint(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& info) override;
+  void OnFirstMeaningfulPaint(
+      const page_load_metrics::PageLoadTiming& timing,
+      const page_load_metrics::PageLoadExtraInfo& info) override;
+
+ private:
+  const bool is_prerender_;
+  ui::PageTransition transition_type_ = ui::PAGE_TRANSITION_LINK;
+
+  DISALLOW_COPY_AND_ASSIGN(OmniboxSuggestionUsedMetricsObserver);
+};
+
+#endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_OMNIBOX_SUGGESTION_USED_PAGE_LOAD_METRICS_OBSERVER_H_