PiP: Enable enter split.

<?xml version="1.0" encoding="utf-8"?>

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<vector xmlns:android="http://schemas.android.com/apk/res/android"

        android:width="@dimen/pip_expand_action_inner_size"

        android:height="@dimen/pip_expand_action_inner_size"

        android:viewportWidth="24"

        android:viewportHeight="24">

    <path

        android:fillColor="#FFFFFF"

        android:pathData="M20,18h-5V6h5V18z M22,18V6c0-1.1-0.9-2-2-2h-5c-1.1,0-2,0.9-2,2v12c0,1.1,0.9,2,2,2h5C21.1,20,22,19.1,22,18z M9,18H4V6h5

		V18z M11,18V6c0-1.1-0.9-2-2-2H4C2.9,4,2,4.9,2,6v12c0,1.1,0.9,2,2,2h5C10.1,20,11,19.1,11,18z" />

</vector>

        <ImageButton

            android:id="@+id/enter_split"

            android:layout_width="@dimen/pip_action_size"

            android:layout_height="@dimen/pip_action_size"

            android:layout_width="@dimen/pip_split_icon_size"

            android:layout_height="@dimen/pip_split_icon_size"

            android:layout_gravity="top|start"

            android:layout_margin="@dimen/pip_split_icon_margin"

            android:gravity="center"

            android:contentDescription="@string/pip_phone_enter_split"

            android:src="@drawable/pip_expand"

            android:src="@drawable/pip_split"

            android:background="?android:selectableItemBackgroundBorderless" />

    </LinearLayout>

    <dimen name="pip_resize_handle_margin">4dp</dimen>

    <dimen name="pip_resize_handle_padding">0dp</dimen>

    <!-- PIP Split icon size and margin. -->

    <dimen name="pip_split_icon_size">24dp</dimen>

    <dimen name="pip_split_icon_margin">12dp</dimen>

    <!-- PIP stash offset size, which is the width of visible PIP region when stashed. -->

    <dimen name="pip_stash_offset">32dp</dimen>

    private static final float MENU_BACKGROUND_ALPHA = 0.3f;

    private static final float DISABLED_ACTION_ALPHA = 0.54f;

    private static final boolean ENABLE_ENTER_SPLIT = false;

    private static final boolean ENABLE_ENTER_SPLIT = true;

    private int mMenuState;

    private boolean mAllowMenuTimeout = true;