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Buffer allocation is time-consuming action. This CL makes
PlatformVideoFramePool not try to allocate new buffers if all the
arguments that affects the physical layout of buffer are not changed.

Bug: 1018817
Bug: 1028406
Test: media_unittests --gtest_filter=PlatformVideoFramePool.*
Test: video_decode_accelerator_tests on Kevin and Eve

Change-Id: I3f1a2b91b0f8c762d7c16f3a873648274176a6d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948009Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721362}