Don't invalidate whole update_rect if buffer conversion didn't change any pixels
Don't invalidate whole update_rect if buffer conversion didn't change any pixels

Bug: webrtc:10310,chromium:930186
Change-Id: Ib7c9937fc376cc6b0ce63538768623e9edbe221f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135123
Reviewed-by: Niels Moller <0057859e47d61d90529d0f66d9ef692cefedb46a@webrtc.org>
Commit-Queue: Ilya Nikolaevskiy <76788ac3efd229e9d156135d9ceb7fef65c45da4@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27859}

TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc