rm pow2 arg to GrDirectContext::ComputeImagesize

Bug: skia:11208
Change-Id: I573be306e168adbd1c521626b2d1e4a303f8d5d9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/368621
Auto-Submit: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index 0d9af45..7cbb66c 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -6,6 +6,8 @@
 
 Milestone 90
 ------------
+  * GrDirectContext::ComputeImageSize() no longer takes nextPow2 argument.
+    https://review.skia.org/368621
 
   * Remove SkImageFilter::MakeMatrixFilter as it was unused and replaced with
     SkImageFilters::MatrixTransform.