Test extension reloading behavior.

content/public/test/test_notification_tracker.h

Index: content/public/test/test_notification_tracker.h
diff --git a/content/public/test/test_notification_tracker.h b/content/public/test/test_notification_tracker.h
index f34fdae614da5b8acd16eea4985cab6c5b41bda9..14735c898cd31c1ce350c52c6211e55e1790fa51 100644
--- a/content/public/test/test_notification_tracker.h
+++ b/content/public/test/test_notification_tracker.h
@@ -61,6 +61,20 @@ class TestNotificationTracker : public NotificationObserver {
                       int type2,
                       int type3);
 
+  // Returns the types of the received notifications in order.  Usable
+  // with EXPECT_THAT(ElementsAre):
+  //   EXPECT_THAT(tracker.GetTypesAndReset(),
+  //               testing::ElementsAre(content::NOTIFICATION_LOAD_START, ...));
+  std::vector<int> GetTypes() const;
+
+  // Like GetTypes, but also calls Reset() so that the next call will
+  // only check for new notifications.
+  std::vector<int> GetTypesAndReset() {
+    std::vector<int> result = GetTypes();
+    Reset();
+    return result;
+  }
+
   // Returns the number of notifications received since the last reset.
   size_t size() const { return events_.size(); }