Warn user when max number of tabs is reached

     Bug: http://b/issue?id=3123994
     A toast is shown when the max number of tabs is reached

Change-Id: I5008e227c91139147920fd214f184061f816a353
diff --git a/src/com/android/browser/BaseUi.java b/src/com/android/browser/BaseUi.java
index b9ccd72..b7c5a82 100644
--- a/src/com/android/browser/BaseUi.java
+++ b/src/com/android/browser/BaseUi.java
@@ -932,4 +932,12 @@
         return mVideoProgressView;
     }
 
+    @Override
+    public void showMaxTabsWarning() {
+        Toast warning = Toast.makeText(mActivity,
+                mActivity.getString(R.string.max_tabs_warning),
+                Toast.LENGTH_SHORT);
+        warning.show();
+    }
+
 }