Expose an uneditable ObserverList from TabBase

BUG=277135

Review URL: https://codereview.chromium.org/26613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227814 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 10 insertions, 0 deletions

diff --git a/chrome/android/java/src/org/chromium/chrome/browser/TabBase.java b/chrome/android/java/src/org/chromium/chrome/browser/TabBase.java
index 5fd0d38a..45e0b84 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/TabBase.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/TabBase.java
@@ -22,6 +22,7 @@ import org.chromium.content.browser.PageInfo;
 import org.chromium.content.browser.WebContentsObserverAndroid;
 import org.chromium.ui.WindowAndroid;
 
+import java.util.Iterator;
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
@@ -350,6 +351,15 @@ public abstract class TabBase implements NavigationClient {
     }
 
     /**
+     * @return An {@link ObserverList.RewindableIterator} instance that points to all of
+     *         the current {@link TabObserver}s on this class.  Note that calling
+     *         {@link Iterator#remove()} will throw an {@link UnsupportedOperationException}.
+     */
+    protected ObserverList.RewindableIterator<TabObserver> getTabObservers() {
+        return mObservers.rewindableIterator();
+    }
+
+    /**
      * @return The {@link ContentViewClient} currently bound to any {@link ContentViewCore}
      *         associated with the current page.  There can still be a {@link ContentViewClient}
      *         even when there is no {@link ContentViewCore}.