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Currently on VideoEncodeAccelerator::Initialize() deafult framerate is
always used to initialize encoder. As we have profile and level of H.264
encoding in initial Config, framerate should be also adjustable on
initialization for the client to configure a supportable parameter set
under the limit of of profile/level.

BUG=871154
TEST=build and deploy chrome on eve
TEST=build and run video_encoder_accelerator_unittest on eve

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ifd6e33ada82d44c0e1b46f56856caeec9600e139
Reviewed-on: https://chromium-review.googlesource.com/1163592Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Pin-chih Lin <johnylin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582510}