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TestInProcessContextProvider was not calling

context is lockable. This change updates TestInProcessContextProvider
to optionally support locking, and set up the ContextCacheController
if locking is requested.

ContextCacheController: :SetLock, which is required in cases where the
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I54d1de3768bf958dea944101565fefb99ff2602e
Reviewed-on: https://chromium-review.googlesource.com/1097945Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566653}