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Add a bool in layer_tree_debug_state. And update the methods
where needed in the cc file.

Declare the flag and its definition in content_switches.

Finally, add the flag in the render_process_host_impl and use it in
the initialization of layer tree settings in render_widget.

Bug: 961846

Change-Id: Ia82da07d65dc5ea829824a077e971b7102e754bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1603404Reviewed-by: enne <enne@chromium.org>
Reviewed-by: Steve Kobes <skobes@chromium.org>
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Rasha Nasri <rnasri@google.com>
Cr-Commit-Position: refs/heads/master@{#659660}