ViewRootImpl: Pass buffer to finishDrawing when requested

As the final enabler for the BLASTSyncEngine, we add a new relayout
result BLAST_SYNC. If the WindowState is participating in a BLAST sync
during relayout we return it to the client. If we return it to the
client the client will direct it's next draw in to a BLAST transaction
and report that transaction via finishDrawing. You can now observe
the BLASTSyncEngine working end to end in TaskOrganizerMultiWindowTests.
We do a few small clean-ups in TaskOrganizerMultiWindowTest while we
are there.

Bug: 153561718
Test: TaskOrganizerMultiWindowTests
Change-Id: I719b731350b942aafa444a33972aaef8973422ea

1 files changed, 8 insertions, 0 deletions

diff --git a/core/java/android/view/WindowManagerGlobal.java b/core/java/android/view/WindowManagerGlobal.java
index 410d9afe73da..ab968d798745 100644
--- a/core/java/android/view/WindowManagerGlobal.java
+++ b/core/java/android/view/WindowManagerGlobal.java
@@ -102,6 +102,14 @@ public final class WindowManagerGlobal {
     public static final int RELAYOUT_RES_CONSUME_ALWAYS_SYSTEM_BARS = 0x40;
 
     /**
+     * This flag indicates the client should not directly submit it's next frame,
+     * but instead should pass it in the postDrawTransaction of
+     * {@link WindowManagerService#finishDrawing}. This is used by the WM
+     * BLASTSyncEngine to synchronize rendering of multiple windows.
+     */
+    public static final int RELAYOUT_RES_BLAST_SYNC = 0x80;
+
+    /**
      * Flag for relayout: the client will be later giving
      * internal insets; as a result, the window will not impact other window
      * layouts until the insets are given.