Improve commit message
Improve commit message

A good commit message is very useful for the rebase merging method.

Bug: skia:
Change-Id: If1d09042fbf3a6fc80a66a1a89946d6e7521460f
Reviewed-on: https://skia-review.googlesource.com/c/170974
Auto-Submit: Yuqian Li <5537666080209cb36918c342659e07eb122af24c@google.com>
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Yuqian Li <5537666080209cb36918c342659e07eb122af24c@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot