Create GoogleURLTrackerClient interface and //chrome implementation

GoogleURLTrackerClient is the interface via which GoogleURLTracker will talk to
its embedder. This CL creates that interface as well as
ChromeGoogleURLTrackerClient, the //chrome implementation. The interface and
implementation are carved out of GoogleURLTrackerNavigationTracker(Impl),
specifically the parts that are not per-tab. A followup CL will modify
GoogleURLTrackerNavigationTracker to the driver interface for
GoogleURLTracker.

BUG=373220

Review URL: https://codereview.chromium.org/285193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271638 0039d316-1c4b-4281-b951-d872f2087c98

13 files changed, 220 insertions, 81 deletions

diff --git a/chrome/browser/google/chrome_google_url_tracker_client.cc b/chrome/browser/google/chrome_google_url_tracker_client.cc
new file mode 100644
index 0000000..2d8a1e5
--- /dev/null
+++ b/chrome/browser/google/chrome_google_url_tracker_client.cc
@@ -0,0 +1,60 @@
+// Copyright 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/chrome_google_url_tracker_client.h"
+
+#include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/google/google_url_tracker.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/web_contents.h"
+
+ChromeGoogleURLTrackerClient::ChromeGoogleURLTrackerClient() {
+}
+
+ChromeGoogleURLTrackerClient::~ChromeGoogleURLTrackerClient() {
+}
+
+void ChromeGoogleURLTrackerClient::SetListeningForNavigationStart(bool listen) {
+  if (listen) {
+    registrar_.Add(
+        this,
+        content::NOTIFICATION_NAV_ENTRY_PENDING,
+        content::NotificationService::AllBrowserContextsAndSources());
+  } else {
+    registrar_.Remove(
+        this,
+        content::NOTIFICATION_NAV_ENTRY_PENDING,
+        content::NotificationService::AllBrowserContextsAndSources());
+  }
+}
+
+bool ChromeGoogleURLTrackerClient::IsListeningForNavigationStart() {
+  return registrar_.IsRegistered(
+      this,
+      content::NOTIFICATION_NAV_ENTRY_PENDING,
+      content::NotificationService::AllBrowserContextsAndSources());
+}
+
+void ChromeGoogleURLTrackerClient::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  DCHECK_EQ(content::NOTIFICATION_NAV_ENTRY_PENDING, type);
+  content::NavigationController* controller =
+      content::Source<content::NavigationController>(source).ptr();
+  InfoBarService* infobar_service =
+      InfoBarService::FromWebContents(controller->GetWebContents());
+  // Because we're listening to all sources, there may be no
+  // InfoBarService for some notifications, e.g. navigations in
+  // bubbles/balloons etc.
+  if (infobar_service) {
+    google_url_tracker()->OnNavigationPending(
+        controller,
+        infobar_service,
+        controller->GetPendingEntry()->GetUniqueID());
+  }
+}
diff --git a/chrome/browser/google/chrome_google_url_tracker_client.h b/chrome/browser/google/chrome_google_url_tracker_client.h
new file mode 100644
index 0000000..89215b2
--- /dev/null
+++ b/chrome/browser/google/chrome_google_url_tracker_client.h
@@ -0,0 +1,33 @@
+// Copyright 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.
+
+#ifndef CHROME_BROWSER_GOOGLE_CHROME_GOOGLE_URL_TRACKER_CLIENT_H_
+#define CHROME_BROWSER_GOOGLE_CHROME_GOOGLE_URL_TRACKER_CLIENT_H_
+
+#include "components/google/core/browser/google_url_tracker_client.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+class ChromeGoogleURLTrackerClient : public GoogleURLTrackerClient,
+                                     public content::NotificationObserver {
+ public:
+  ChromeGoogleURLTrackerClient();
+  virtual ~ChromeGoogleURLTrackerClient();
+
+  // GoogleURLTrackerClient:
+  virtual void SetListeningForNavigationStart(bool listen) OVERRIDE;
+  virtual bool IsListeningForNavigationStart() OVERRIDE;
+
+ private:
+  // content::NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeGoogleURLTrackerClient);
+};
+
+#endif  // CHROME_BROWSER_GOOGLE_CHROME_GOOGLE_URL_TRACKER_CLIENT_H_
diff --git a/chrome/browser/google/google_url_tracker.cc b/chrome/browser/google/google_url_tracker.cc
index 5f93554..62daab0 100644
--- a/chrome/browser/google/google_url_tracker.cc
+++ b/chrome/browser/google/google_url_tracker.cc
@@ -17,6 +17,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
+#include "components/google/core/browser/google_url_tracker_client.h"
 #include "components/infobars/core/infobar.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
@@ -34,12 +35,15 @@ const char GoogleURLTracker::kSearchDomainCheckURL[] =
 
 GoogleURLTracker::GoogleURLTracker(
     Profile* profile,
+    scoped_ptr<GoogleURLTrackerClient> client,
     scoped_ptr<GoogleURLTrackerNavigationHelper> nav_helper,
     Mode mode)
     : profile_(profile),
+      client_(client.Pass()),
       nav_helper_(nav_helper.Pass()),
       infobar_creator_(base::Bind(&GoogleURLTrackerInfoBarDelegate::Create)),
-      google_url_(mode == UNIT_TEST_MODE ? kDefaultGoogleHomepage :
+      google_url_(mode == UNIT_TEST_MODE ?
+          kDefaultGoogleHomepage :
           profile->GetPrefs()->GetString(prefs::kLastKnownGoogleURL)),
       fetcher_id_(0),
       in_startup_sleep_(true),
@@ -49,6 +53,7 @@ GoogleURLTracker::GoogleURLTracker(
       search_committed_(false),
       weak_ptr_factory_(this) {
   net::NetworkChangeNotifier::AddIPAddressObserver(this);
+  client_->set_google_url_tracker(this);
   nav_helper_->SetGoogleURLTracker(this);
 
   // Because this function can be called during startup, when kicking off a URL
@@ -199,6 +204,7 @@ void GoogleURLTracker::OnIPAddressChanged() {
 }
 
 void GoogleURLTracker::Shutdown() {
+  client_.reset();
   nav_helper_.reset();
   fetcher_.reset();
   weak_ptr_factory_.InvalidateWeakPtrs();
@@ -269,8 +275,8 @@ void GoogleURLTracker::SearchCommitted() {
     search_committed_ = true;
     // These notifications will fire a bit later in the same call chain we're
     // currently in.
-    if (!nav_helper_->IsListeningForNavigationStart())
-      nav_helper_->SetListeningForNavigationStart(true);
+    if (!client_->IsListeningForNavigationStart())
+      client_->SetListeningForNavigationStart(true);
   }
 }
 
@@ -415,13 +421,13 @@ void GoogleURLTracker::UnregisterForEntrySpecificNotifications(
        ++i) {
     if (nav_helper_->IsListeningForNavigationCommit(
             i->second->navigation_controller())) {
-      DCHECK(nav_helper_->IsListeningForNavigationStart());
+      DCHECK(client_->IsListeningForNavigationStart());
       return;
     }
   }
-  if (nav_helper_->IsListeningForNavigationStart()) {
+  if (client_->IsListeningForNavigationStart()) {
     DCHECK(!search_committed_);
-    nav_helper_->SetListeningForNavigationStart(false);
+    client_->SetListeningForNavigationStart(false);
   }
 }
 
diff --git a/chrome/browser/google/google_url_tracker.h b/chrome/browser/google/google_url_tracker.h
index 0b1ca97..5e8ba1a 100644
--- a/chrome/browser/google/google_url_tracker.h
+++ b/chrome/browser/google/google_url_tracker.h
@@ -21,6 +21,7 @@
 #include "net/url_request/url_fetcher_delegate.h"
 #include "url/gurl.h"
 
+class GoogleURLTrackerClient;
 class GoogleURLTrackerNavigationHelper;
 class PrefService;
 class Profile;
@@ -70,6 +71,7 @@ class GoogleURLTracker : public net::URLFetcherDelegate,
   // than the GoogleURLTracker itself should actually use
   // GoogleURLTrackerFactory::GetForProfile().
   GoogleURLTracker(Profile* profile,
+                   scoped_ptr<GoogleURLTrackerClient> client,
                    scoped_ptr<GoogleURLTrackerNavigationHelper> nav_helper,
                    Mode mode);
 
@@ -109,12 +111,12 @@ class GoogleURLTracker : public net::URLFetcherDelegate,
   // No one but GoogleURLTrackerMapEntry should call this.
   void DeleteMapEntryForService(const InfoBarService* infobar_service);
 
-  // Called by the navigation observer after SearchCommitted() registers
-  // listeners, to indicate that we've received the "load now pending"
-  // notification.  |navigation_controller| is the NavigationController for this
-  // load; |infobar_service| is the InfoBarService of the associated tab; and
-  // |pending_id| is the unique ID of the newly pending NavigationEntry.
-  // If there is already a visible GoogleURLTracker infobar for this tab, this
+  // Called by the client after SearchCommitted() registers listeners, to
+  // indicate that we've received the "load now pending" notification.
+  // |navigation_controller| is the NavigationController for this load;
+  // |infobar_service| is the InfoBarService of the associated tab; and
+  // |pending_id| is the unique ID of the newly pending NavigationEntry.  If
+  // there is already a visible GoogleURLTracker infobar for this tab, this
   // function resets its associated pending entry ID to the new ID.  Otherwise
   // this function creates a map entry for the associated tab.
   virtual void OnNavigationPending(
@@ -188,6 +190,8 @@ class GoogleURLTracker : public net::URLFetcherDelegate,
 
   Profile* profile_;
 
+  scoped_ptr<GoogleURLTrackerClient> client_;
+
   scoped_ptr<GoogleURLTrackerNavigationHelper> nav_helper_;
 
   // Creates an infobar and adds it to the provided InfoBarService.  Returns the
diff --git a/chrome/browser/google/google_url_tracker_factory.cc b/chrome/browser/google/google_url_tracker_factory.cc
index c0ae59b..239eabc 100644
--- a/chrome/browser/google/google_url_tracker_factory.cc
+++ b/chrome/browser/google/google_url_tracker_factory.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/google/google_url_tracker_factory.h"
 
 #include "base/prefs/pref_service.h"
+#include "chrome/browser/google/chrome_google_url_tracker_client.h"
 #include "chrome/browser/google/google_url_tracker.h"
 #include "chrome/browser/google/google_url_tracker_navigation_helper_impl.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
@@ -36,9 +37,12 @@ GoogleURLTrackerFactory::~GoogleURLTrackerFactory() {
 
 KeyedService* GoogleURLTrackerFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
+  scoped_ptr<GoogleURLTrackerClient> client(new ChromeGoogleURLTrackerClient());
   scoped_ptr<GoogleURLTrackerNavigationHelper> nav_helper(
       new GoogleURLTrackerNavigationHelperImpl());
-  return new GoogleURLTracker(static_cast<Profile*>(profile), nav_helper.Pass(),
+  return new GoogleURLTracker(static_cast<Profile*>(profile),
+                              client.Pass(),
+                              nav_helper.Pass(),
                               GoogleURLTracker::NORMAL_MODE);
 }
 
diff --git a/chrome/browser/google/google_url_tracker_navigation_helper.h b/chrome/browser/google/google_url_tracker_navigation_helper.h
index f48e6f0..26b7a53 100644
--- a/chrome/browser/google/google_url_tracker_navigation_helper.h
+++ b/chrome/browser/google/google_url_tracker_navigation_helper.h
@@ -19,17 +19,9 @@ class GoogleURLTrackerNavigationHelper {
  public:
   virtual ~GoogleURLTrackerNavigationHelper() {}
 
-  // Sets the GoogleURLTracker that should receive callbacks from this observer.
+  // Sets the GoogleURLTracker that is associated with this object.
   virtual void SetGoogleURLTracker(GoogleURLTracker* tracker) = 0;
 
-  // Enables or disables listening for navigation starts. OnNavigationPending
-  // will be called for each navigation start if listening is enabled.
-  virtual void SetListeningForNavigationStart(bool listen) = 0;
-
-  // Returns whether or not the observer is currently listening for navigation
-  // starts.
-  virtual bool IsListeningForNavigationStart() = 0;
-
   // Enables or disables listening for navigation commits for the given
   // NavigationController. OnNavigationCommitted will be called for each
   // navigation commit if listening is enabled.
diff --git a/chrome/browser/google/google_url_tracker_navigation_helper_impl.cc b/chrome/browser/google/google_url_tracker_navigation_helper_impl.cc
index b6aa6c3..64e4c5c 100644
--- a/chrome/browser/google/google_url_tracker_navigation_helper_impl.cc
+++ b/chrome/browser/google/google_url_tracker_navigation_helper_impl.cc
@@ -26,22 +26,6 @@ void GoogleURLTrackerNavigationHelperImpl::SetGoogleURLTracker(
   tracker_ = tracker;
 }
 
-void GoogleURLTrackerNavigationHelperImpl::SetListeningForNavigationStart(
-    bool listen) {
-  if (listen) {
-    registrar_.Add(this, content::NOTIFICATION_NAV_ENTRY_PENDING,
-        content::NotificationService::AllBrowserContextsAndSources());
-  } else {
-    registrar_.Remove(this, content::NOTIFICATION_NAV_ENTRY_PENDING,
-        content::NotificationService::AllBrowserContextsAndSources());
-  }
-}
-
-bool GoogleURLTrackerNavigationHelperImpl::IsListeningForNavigationStart() {
-  return registrar_.IsRegistered(this, content::NOTIFICATION_NAV_ENTRY_PENDING,
-      content::NotificationService::AllBrowserContextsAndSources());
-}
-
 void GoogleURLTrackerNavigationHelperImpl::SetListeningForNavigationCommit(
     const content::NavigationController* nav_controller,
     bool listen) {
@@ -104,23 +88,6 @@ void GoogleURLTrackerNavigationHelperImpl::Observe(
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   switch (type) {
-    case content::NOTIFICATION_NAV_ENTRY_PENDING: {
-      content::NavigationController* controller =
-          content::Source<content::NavigationController>(source).ptr();
-      content::WebContents* web_contents = controller->GetWebContents();
-      InfoBarService* infobar_service =
-          InfoBarService::FromWebContents(web_contents);
-      // Because we're listening to all sources, there may be no
-      // InfoBarService for some notifications, e.g. navigations in
-      // bubbles/balloons etc.
-      if (infobar_service) {
-        tracker_->OnNavigationPending(
-            controller, infobar_service,
-            controller->GetPendingEntry()->GetUniqueID());
-      }
-      break;
-    }
-
     case content::NOTIFICATION_NAV_ENTRY_COMMITTED: {
       content::NavigationController* controller =
           content::Source<content::NavigationController>(source).ptr();
diff --git a/chrome/browser/google/google_url_tracker_navigation_helper_impl.h b/chrome/browser/google/google_url_tracker_navigation_helper_impl.h
index 2900590..b024744 100644
--- a/chrome/browser/google/google_url_tracker_navigation_helper_impl.h
+++ b/chrome/browser/google/google_url_tracker_navigation_helper_impl.h
@@ -19,8 +19,6 @@ class GoogleURLTrackerNavigationHelperImpl
 
   // GoogleURLTrackerNavigationHelper.
   virtual void SetGoogleURLTracker(GoogleURLTracker* tracker) OVERRIDE;
-  virtual void SetListeningForNavigationStart(bool listen) OVERRIDE;
-  virtual bool IsListeningForNavigationStart() OVERRIDE;
   virtual void SetListeningForNavigationCommit(
       const content::NavigationController* nav_controller,
       bool listen) OVERRIDE;
@@ -33,8 +31,6 @@ class GoogleURLTrackerNavigationHelperImpl
       const content::NavigationController* nav_controller) OVERRIDE;
 
  private:
-  friend class GoogleURLTrackerNavigationHelperTest;
-
   // content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
diff --git a/chrome/browser/google/google_url_tracker_unittest.cc b/chrome/browser/google/google_url_tracker_unittest.cc
index e77fb50..6b2fedf 100644
--- a/chrome/browser/google/google_url_tracker_unittest.cc
+++ b/chrome/browser/google/google_url_tracker_unittest.cc
@@ -15,6 +15,7 @@
 #include "chrome/browser/google/google_url_tracker_navigation_helper.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
+#include "components/google/core/browser/google_url_tracker_client.h"
 #include "components/infobars/core/infobar.h"
 #include "components/infobars/core/infobar_delegate.h"
 #include "content/public/browser/notification_service.h"
@@ -104,7 +105,39 @@ void TestCallbackListener::RegisterCallback(
           &TestCallbackListener::OnGoogleURLUpdated, base::Unretained(this)));
 }
 
-// TestGoogleURLTrackerNavigationHelper -------------------------------------
+
+// TestGoogleURLTrackerClient -------------------------------------------------
+
+class TestGoogleURLTrackerClient : public GoogleURLTrackerClient {
+ public:
+  TestGoogleURLTrackerClient();
+  virtual ~TestGoogleURLTrackerClient();
+
+  virtual void SetListeningForNavigationStart(bool listen) OVERRIDE;
+  virtual bool IsListeningForNavigationStart() OVERRIDE;
+
+ private:
+  bool observe_nav_start_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestGoogleURLTrackerClient);
+};
+
+TestGoogleURLTrackerClient::TestGoogleURLTrackerClient()
+    : observe_nav_start_(false) {
+}
+
+TestGoogleURLTrackerClient::~TestGoogleURLTrackerClient() {
+}
+
+void TestGoogleURLTrackerClient::SetListeningForNavigationStart(bool listen) {
+  observe_nav_start_ = listen;
+}
+
+bool TestGoogleURLTrackerClient::IsListeningForNavigationStart() {
+  return observe_nav_start_;
+}
+
+// TestGoogleURLTrackerNavigationHelper ---------------------------------------
 
 class TestGoogleURLTrackerNavigationHelper
     : public GoogleURLTrackerNavigationHelper {
@@ -113,8 +146,6 @@ class TestGoogleURLTrackerNavigationHelper
   virtual ~TestGoogleURLTrackerNavigationHelper();
 
   virtual void SetGoogleURLTracker(GoogleURLTracker* tracker) OVERRIDE;
-  virtual void SetListeningForNavigationStart(bool listen) OVERRIDE;
-  virtual bool IsListeningForNavigationStart() OVERRIDE;
   virtual void SetListeningForNavigationCommit(
       const content::NavigationController* nav_controller,
       bool listen) OVERRIDE;
@@ -128,7 +159,6 @@ class TestGoogleURLTrackerNavigationHelper
 
  private:
   GoogleURLTracker* tracker_;
-  bool observe_nav_start_;
   std::set<const content::NavigationController*>
       nav_controller_commit_listeners_;
   std::set<const content::NavigationController*>
@@ -136,8 +166,7 @@ class TestGoogleURLTrackerNavigationHelper
 };
 
 TestGoogleURLTrackerNavigationHelper::TestGoogleURLTrackerNavigationHelper()
-    : tracker_(NULL),
-      observe_nav_start_(false) {
+    : tracker_(NULL) {
 }
 
 TestGoogleURLTrackerNavigationHelper::
@@ -149,15 +178,6 @@ void TestGoogleURLTrackerNavigationHelper::SetGoogleURLTracker(
   tracker_ = tracker;
 }
 
-void TestGoogleURLTrackerNavigationHelper::SetListeningForNavigationStart(
-    bool listen) {
-  observe_nav_start_ = listen;
-}
-
-bool TestGoogleURLTrackerNavigationHelper::IsListeningForNavigationStart() {
-  return observe_nav_start_;
-}
-
 void TestGoogleURLTrackerNavigationHelper::SetListeningForNavigationCommit(
     const content::NavigationController* nav_controller,
     bool listen) {
@@ -261,6 +281,7 @@ class GoogleURLTrackerTest : public testing::Test {
   // net::NetworkChangeNotifier::NotifyObserversOfIPAddressChangeForTests().
   scoped_ptr<net::NetworkChangeNotifier> network_change_notifier_;
   net::TestURLFetcherFactory fetcher_factory_;
+  GoogleURLTrackerClient* client_;
   GoogleURLTrackerNavigationHelper* nav_helper_;
   TestingProfile profile_;
   scoped_ptr<GoogleURLTracker> google_url_tracker_;
@@ -300,12 +321,16 @@ GoogleURLTrackerTest::~GoogleURLTrackerTest() {
 
 void GoogleURLTrackerTest::SetUp() {
   network_change_notifier_.reset(net::NetworkChangeNotifier::CreateMock());
-  // Ownership is passed to google_url_tracker_, but a weak pointer is kept;
-  // this is safe since GoogleURLTracker keeps the observer for its lifetime.
+  // Ownership is passed to google_url_tracker_, but weak pointers are kept;
+  // this is safe since GoogleURLTracker keeps these objects for its lifetime.
+  client_ = new TestGoogleURLTrackerClient();
   nav_helper_ = new TestGoogleURLTrackerNavigationHelper();
+  scoped_ptr<GoogleURLTrackerClient> client(client_);
   scoped_ptr<GoogleURLTrackerNavigationHelper> nav_helper(nav_helper_);
   google_url_tracker_.reset(
-      new GoogleURLTracker(&profile_, nav_helper.Pass(),
+      new GoogleURLTracker(&profile_,
+                           client.Pass(),
+                           nav_helper.Pass(),
                            GoogleURLTracker::UNIT_TEST_MODE));
   google_url_tracker_->infobar_creator_ = base::Bind(
       &GoogleURLTrackerTest::CreateTestInfoBar, base::Unretained(this));
@@ -314,9 +339,6 @@ void GoogleURLTrackerTest::SetUp() {
 void GoogleURLTrackerTest::TearDown() {
   while (!unique_ids_seen_.empty())
     CloseTab(*unique_ids_seen_.begin());
-
-  nav_helper_ = NULL;
-  network_change_notifier_.reset();
 }
 
 net::TestURLFetcher* GoogleURLTrackerTest::GetFetcher() {
@@ -371,7 +393,7 @@ void GoogleURLTrackerTest::SetNavigationPending(intptr_t unique_id,
     // for navigation starts if the searchdomaincheck response was bogus.
   }
   unique_ids_seen_.insert(unique_id);
-  if (nav_helper_->IsListeningForNavigationStart()) {
+  if (client_->IsListeningForNavigationStart()) {
     google_url_tracker_->OnNavigationPending(
         reinterpret_cast<content::NavigationController*>(unique_id),
         reinterpret_cast<InfoBarService*>(unique_id), unique_id);
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 4749931..d1c0021 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -681,6 +681,8 @@
         'browser/geolocation/geolocation_prefs.h',
         'browser/global_keyboard_shortcuts_mac.h',
         'browser/global_keyboard_shortcuts_mac.mm',
+        'browser/google/chrome_google_url_tracker_client.cc',
+        'browser/google/chrome_google_url_tracker_client.h',
         'browser/google/google_search_counter.cc',
         'browser/google/google_search_counter.h',
         'browser/google/google_update_settings_posix.cc',
diff --git a/components/google.gypi b/components/google.gypi
index a6c41385..ea4c75d 100644
--- a/components/google.gypi
+++ b/components/google.gypi
@@ -16,6 +16,8 @@
       'sources': [
         'google/core/browser/google_search_metrics.cc',
         'google/core/browser/google_search_metrics.h',
+        'google/core/browser/google_url_tracker_client.cc',
+        'google/core/browser/google_url_tracker_client.h',
       ],
     },
   ],
diff --git a/components/google/core/browser/google_url_tracker_client.cc b/components/google/core/browser/google_url_tracker_client.cc
new file mode 100644
index 0000000..c3c6c23
--- /dev/null
+++ b/components/google/core/browser/google_url_tracker_client.cc
@@ -0,0 +1,11 @@
+// Copyright 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 "components/google/core/browser/google_url_tracker_client.h"
+
+GoogleURLTrackerClient::GoogleURLTrackerClient() : google_url_tracker_(NULL) {
+}
+
+GoogleURLTrackerClient::~GoogleURLTrackerClient() {
+}
diff --git a/components/google/core/browser/google_url_tracker_client.h b/components/google/core/browser/google_url_tracker_client.h
new file mode 100644
index 0000000..ab9e271
--- /dev/null
+++ b/components/google/core/browser/google_url_tracker_client.h
@@ -0,0 +1,40 @@
+// Copyright 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.
+
+#ifndef COMPONENTS_GOOGLE_GOOGLE_URL_TRACKER_CLIENT_H_
+#define COMPONENTS_GOOGLE_GOOGLE_URL_TRACKER_CLIENT_H_
+
+#include "base/macros.h"
+
+class GoogleURLTracker;
+
+// Interface by which GoogleURLTracker communicates with its embedder.
+class GoogleURLTrackerClient {
+ public:
+  GoogleURLTrackerClient();
+  virtual ~GoogleURLTrackerClient();
+
+  // Sets the GoogleURLTracker that is associated with this client.
+  void set_google_url_tracker(GoogleURLTracker* google_url_tracker) {
+    google_url_tracker_ = google_url_tracker;
+  }
+
+  // Enables or disables listening for navigation starts. OnNavigationPending
+  // will be called for each navigation start if listening is enabled.
+  virtual void SetListeningForNavigationStart(bool listen) = 0;
+
+  // Returns whether or not the client is currently listening for navigation
+  // starts.
+  virtual bool IsListeningForNavigationStart() = 0;
+
+ protected:
+  GoogleURLTracker* google_url_tracker() { return google_url_tracker_; }
+
+ private:
+  GoogleURLTracker* google_url_tracker_;
+
+  DISALLOW_COPY_AND_ASSIGN(GoogleURLTrackerClient);
+};
+
+#endif  // COMPONENTS_GOOGLE_GOOGLE_URL_TRACKER_CLIENT_H_