Merge "Animate the action bar's Up chevron as it shows and hides." into jb-mr1-dev

import com.android.internal.view.menu.MenuView;

import com.android.internal.view.menu.SubMenuBuilder;

import android.animation.LayoutTransition;

import android.app.ActionBar;

import android.app.ActionBar.OnNavigationListener;

import android.app.Activity;

        private ImageView mIconView;

        private int mUpWidth;

        private static final long DEFAULT_TRANSITION_DURATION = 150;

        public HomeView(Context context) {

            this(context, null);

        }

        public HomeView(Context context, AttributeSet attrs) {

            super(context, attrs);

            LayoutTransition t = getLayoutTransition();

            if (t != null) {

                // Set a lower duration than the default

                t.setDuration(DEFAULT_TRANSITION_DURATION);

            }

        }

        public void setUp(boolean isUp) {

      class="com.android.internal.widget.ActionBarView$HomeView"

      android:layout_width="wrap_content"

      android:layout_height="match_parent"

      android:background="?android:attr/actionBarItemBackground" >

      android:background="?android:attr/actionBarItemBackground"

      android:animateLayoutChanges="true">

    <ImageView android:id="@android:id/up"

               android:src="?android:attr/homeAsUpIndicator"

               android:layout_gravity="center_vertical|start"