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Originally we assume the FPS of all encoders should be larger than the
minimum FPS 30. But the FPS for multiple encoder test case should be
divided by the number of the encoders. This CL changes the timeout to
2 seconds assuming the FPS should be at least larger than 5.

Bug: chromium:820313
Test: Pass video_encode_accelerator_unittest with 1920x1080 video at
      scarlet device

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;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ic91a6aa8b00ee0bdb73da407e4c435ea2979a2c4
Reviewed-on: https://chromium-review.googlesource.com/997253Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549404}