Remove submit from async read pixels. User must submit.

Bug: chromium:1087118

Change-Id: Iab152ac483787fbdcca448aee0c4b9d2b354a92b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/292840
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index e170cad..8da29c7 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -8,6 +8,11 @@
 ------------
 
   * <insert new release notes here>
+  
+  * SkSurface::asyncRescaleAndReadPixels and SkSurfaceasyncRescaleAndReadPixelsYUV420
+    now require explicit GrContext submit to guarantee finite time before callback
+    is invoked.
+    https://review.skia.org/292840
 
   * Add VkSharingMode field to GrVkImageInfo.
     https://review.skia.org/293559