Add an outdated upgrade bubble view.

chrome/browser/upgrade_detector_impl.h

Index: chrome/browser/upgrade_detector_impl.h
diff --git a/chrome/browser/upgrade_detector_impl.h b/chrome/browser/upgrade_detector_impl.h
index 435d294b662f214c6a3edca76eb124527b723ba8..178d25d84f6805720f023ddb83a4b01cf987ae37 100644
--- a/chrome/browser/upgrade_detector_impl.h
+++ b/chrome/browser/upgrade_detector_impl.h
@@ -23,18 +23,33 @@ class UpgradeDetectorImpl : public UpgradeDetector {
 
   UpgradeDetectorImpl();
 
+  // Start the timer that will call |CheckForUpgrade()|.
+  void StartTimerForUpgradeCheck();
+
   // Launches a task on the file thread to check if we have the latest version.
   void CheckForUpgrade();
 
   // Sends out a notification and starts a one shot timer to wait until
   // notifying the user.
-  void UpgradeDetected();
+  void UpgradeDetected(UpgradeAvailable upgrade_available);
+
+  // Returns true after calling UpgradeDetected if current install is outdated.
+  bool DetectOutdatedInstall();
 
   // The function that sends out a notification (after a certain time has
   // elapsed) that lets the rest of the UI know we should start notifying the
   // user that a new version is available.
   void NotifyOnUpgrade();
 
+  // Called on the FILE thread to detect an upgrade. Calls back UpgradeDetected
+  // on the UI thread if so. Although it looks weird, this needs to be a static
+  // method receiving a WeakPtr<> to this object so that we can interrupt
+  // the UpgradeDetected callback before it runs. Having this method non-static
+  // and using |this| directly wouldn't be thread safe. And keeping it as a
+  // non-class function would prevent it from calling UpgradeDetected.
+  static void DetectUpgradeTask(
+      base::WeakPtr<UpgradeDetectorImpl> upgrade_detector);
+
   // We periodically check to see if Chrome has been upgraded.
   base::RepeatingTimer<UpgradeDetectorImpl> detect_upgrade_timer_;
 
@@ -50,6 +65,9 @@ class UpgradeDetectorImpl : public UpgradeDetector {
   // True if this build is a dev or canary channel build.
   bool is_unstable_channel_;
 
+  // The date the binaries were built.
+  base::Time build_date_;
+
   DISALLOW_COPY_AND_ASSIGN(UpgradeDetectorImpl);
 };