Reland of Update media notification when page title changes

content/public/android/java/src/org/chromium/content_public/browser/WebContents.java

Index: content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
diff --git a/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java b/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
index 4a1729b1a90fbce882cd943cfbf5b2c3dec951f7..e58dd60a477bf977061081c4511032dd60bcc26c 100644
--- a/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
+++ b/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
@@ -8,6 +8,7 @@
 import android.graphics.Rect;
 import android.os.Parcelable;
 
+import org.chromium.base.ObserverList;
 import org.chromium.base.VisibleForTesting;
 
 /**
@@ -323,6 +324,12 @@
     void removeObserver(WebContentsObserver observer);
 
     /**
+     * @return The list of observers.
+     */
+    @VisibleForTesting
+    ObserverList.RewindableIterator<WebContentsObserver> getObserversForTesting();
+
+    /**
      * Called when context menu gets opened.
      */
     void onContextMenuOpened();