Add divider view support for app-pairs

Add divider bar for app-pairs. AppPairLayout and divide policy records
and handles the layout in pair.

Bug: 172704238
Bug: 172704672
Test: manul check the behavior of the splits and divider bar.
Test: AppPairTests, AppPairsPoolTests, AppPairsControllerTests

Change-Id: I688c7001d056fe8dd9a192885e1f9fd5f004dc11

1 files changed, 8 insertions, 1 deletions

diff --git a/core/java/android/view/WindowlessWindowManager.java b/core/java/android/view/WindowlessWindowManager.java
index 5e5d14f55240..0ed7ca79113e 100644
--- a/core/java/android/view/WindowlessWindowManager.java
+++ b/core/java/android/view/WindowlessWindowManager.java
@@ -207,12 +207,19 @@ public class WindowlessWindowManager implements IWindowSession {
     }
 
     /** @hide */
+    @Nullable
     protected SurfaceControl getSurfaceControl(View rootView) {
         final ViewRootImpl root = rootView.getViewRootImpl();
         if (root == null) {
             return null;
         }
-        final State s = mStateForWindow.get(root.mWindow.asBinder());
+        return getSurfaceControl(root.mWindow);
+    }
+
+    /** @hide */
+    @Nullable
+    protected SurfaceControl getSurfaceControl(IWindow window) {
+        final State s = mStateForWindow.get(window.asBinder());
         if (s == null) {
             return null;
         }