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The flag --enable-viz-devtools will be used to initialize Viz DevTools server and
observe Viz Display Compositor objects from the GPU process. Now on creating of the
DevTools server from the browser process we pass the flag we need to search for in
the command line to determine whether to enable devtools or not and a default port
number to run the server on. When we start chrome along with the devtools flag we
can specify the port number we want the server to run on, but it is optional, so
if nothing's specified we pass the default port number to run the server on.
Later the GPU process will also pass its corresponding parameters.

Bug: 816802
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I8f5e461758cf7aa0e575680e659c45232a9fd8e2
Reviewed-on: https://chromium-review.googlesource.com/943247Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Illia Martyniuk <illiam@google.com>
Cr-Commit-Position: refs/heads/master@{#542931}