Added virtual test suite with 1MB MSE buffers
This will run media-source*quota-exceeded tests in a virtual test suite
with MSE audio and video buffer sizes set to 1MB. Normally those tests
time out in Debug mode, since the default MSE audio buffer size is 12MB
and that takes to long to fill up in Debug build.
BUG=
630342
Committed:
https://crrev.com/2f93caffe7a63bdcb391e23f67c67ceb69718a0f
Cr-Commit-Position: refs/heads/master@{#409518}