Add UMA metrics for Android Chrome Google Search.

chrome/browser/google/google_search_counter_android.cc

+// Copyright (c) 2014 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 "chrome/browser/google/google_search_counter_android.h"
+
+#include "base/logging.h"
+#include "chrome/browser/google/google_search_counter.h"
+#include "chrome/browser/google/google_util.h"
+#include "chrome/browser/prerender/prerender_manager.h"
+#include "chrome/browser/prerender/prerender_manager_factory.h"
+#include "components/google/core/browser/google_search_metrics.h"
+#include "content/public/browser/navigation_details.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
+
+GoogleSearchCounterAndroid::GoogleSearchCounterAndroid(Profile* profile)
+    : profile_(profile) {
+  // We always listen for all COMMITTED navigations from all sources, as any
+  // one of them could be a navigation of interest.
+  registrar_.Add(this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
+                 content::NotificationService::AllSources());
+}
+
+GoogleSearchCounterAndroid::~GoogleSearchCounterAndroid() {
+}
+
+void GoogleSearchCounterAndroid::ProcessCommittedEntry(
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  GoogleSearchCounter* counter = GoogleSearchCounter::GetInstance();
+  DCHECK(counter);
+  if (!counter->ShouldRecordCommittedDetails(details))
+    return;
+
+  const content::LoadCommittedDetails* commit =
+      content::Details<content::LoadCommittedDetails>(details).ptr();
+  const content::NavigationEntry& entry = *commit->entry;
+  prerender::PrerenderManager* prerender_manager =
+      prerender::PrerenderManagerFactory::GetForProfile(profile_);
+  DCHECK(prerender_manager);
+  counter->search_metrics()->RecordAndroidGoogleSearch(
+      google_util::GetGoogleSearchAccessPointForNavEntry(entry),
+      prerender_manager->IsEnabled());
+}
+
+void GoogleSearchCounterAndroid::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  switch (type) {

[Peter Kasting, 2014/06/19 21:20:32]

Just DCHECK_EQ(content::NOTIFICATION_NAV_ENTRY_COMMITTED, type); and then handle
it.  Kill the switch entirely.

[kmadhusu, 2014/06/19 22:52:49]

Done.

+    case content::NOTIFICATION_NAV_ENTRY_COMMITTED:
+      ProcessCommittedEntry(source, details);
+      break;
+    default:
+      NOTREACHED();
+  }
+}