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Move MockCodecBufferWaitCoordinator in a separate file. This will be
helpful in refactoring current media code to merge SurfaceOwner and
TextureOwner which will requires reorganising and moving some files
and unittests to different locations/directories.

Bug: 989344
Change-Id: Ie25bad59174de86b5b4c623c9f94a365becdccce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1744640Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: vikas soni <vikassoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685418}