Make action bar title a valid touch target for up when relevant

arubin bug 7966136

Change-Id: Iea5b85852cc1664f1390a6f8b6179d63b50857e4
diff --git a/core/java/com/android/internal/widget/ActionBarView.java b/core/java/com/android/internal/widget/ActionBarView.java
index 6fb459c..27ecd9a 100644
--- a/core/java/com/android/internal/widget/ActionBarView.java
+++ b/core/java/com/android/internal/widget/ActionBarView.java
@@ -1051,6 +1051,7 @@
                     (mDisplayOptions & ActionBar.DISPLAY_SHOW_TITLE) != 0;
             if (showTitle) {
                 x += positionChild(mTitleLayout, x, y, contentHeight, isLayoutRtl);
+                homeSlop = mTitleLayout.getWidth();
             }
 
             switch (mNavigationMode) {