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Previously all web_engine processes had the same name, which made it
hard to distinguish between processes. Now each process started by
web_engine will have the name suffixed with process type, e.g.
web_engine_exe:renderer.

Change-Id: Ic1fa0f4f7bc87f4789d0d6d85d71d836d89df99f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769996
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690787}