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To support blink::Thread::ThreadId(), a synchronous wait is necessary
on blink::WorkerThread creation. To make it possible to remove the
synchronous wait in an upcoming CL, we remove
blink::Thread::ThreadId() in this CL.

Usage is replaced by other mechanisms:

1. Change the priority of the compositor thread
After creating the compositor thread, we post a task to it to obtain its
tid via base::PlatformThread::CurrentId(). We send the obtained tid to
the browser process so it can set the desired thread priority.

2. Store the tid in WorkerInspectorController
Since the code runs on the worker thread, we can just invoke
base::PlatformThread::CurrentId() instead of blink::Thread::ThreadId().

3. Generate an AgentId for testing
Instead of using the tid of the main thread as a unique identifier,
we use base::GetCurrentProcId().

Bug: 1080709
Change-Id: If92718a2e28b1d9e8ab9f259c95a5f27aee87e66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580005
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843041}