Add size-check for ShapeResult

Change-Id: I96587805e3f3bc5e72d86eb2098fa665d7f23cb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391945Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804246}

third_party/blink/renderer/platform/fonts/shaping/shape_result.cc

@@ -63,6 +63,16 @@ struct SameSizeAsHarfBuzzRunGlyphData {
 
 ASSERT_SIZE(HarfBuzzRunGlyphData, SameSizeAsHarfBuzzRunGlyphData);
 
+struct SameSizeAsShapeResult : public RefCounted<SameSizeAsShapeResult> {
+  float floats[5];
+  Vector<int> vector;
+  void* pointers[2];
+  unsigned integers[2];
+  unsigned bitfields : 32;
+};
+
+ASSERT_SIZE(ShapeResult, SameSizeAsShapeResult);
+
 unsigned ShapeResult::RunInfo::NextSafeToBreakOffset(unsigned offset) const {
   DCHECK_LE(offset, num_characters_);
   if (!Rtl()) {