Perform traversal after finish drawing for Blast Sync

Normally, a perform traversal wouldn't get called if
WSA.finishDrawingLocked doesn't return true. It only returns true if
the previous drawState was DRAW_PENDING which may not be the case if
it's not the first draw.

With blast sync, we will get a finish draw but not necessary the first
draw. That means we may never trigger the perform traversal. We always
wait for a perform traversal before notifying blast sync that we're done
in case there's more data to gather into the transaction.

In this change, always trigger perform traversal if finishDrawing was
called because of blast sync.

Test: Hard to trigger, but existing sync works
Change-Id: Id95c0c84418cecd0e73befafe524102f9e3faad2

1 files changed, 3 insertions, 1 deletions

diff --git a/services/core/java/com/android/server/wm/WindowState.java b/services/core/java/com/android/server/wm/WindowState.java
index 1f7457c088c5..27603fe121ab 100644
--- a/services/core/java/com/android/server/wm/WindowState.java
+++ b/services/core/java/com/android/server/wm/WindowState.java
@@ -5893,7 +5893,9 @@ class WindowState extends WindowContainer<WindowState> implements WindowManagerP
         }
 
         mNotifyBlastOnSurfacePlacement = true;
-        return mWinAnimator.finishDrawingLocked(null);
+        mWinAnimator.finishDrawingLocked(null);
+        // We always want to force a traversal after a finish draw for blast sync.
+        return true;
     }
 
     private void notifyBlastSyncTransaction() {