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The CL maps the Page.setWebLifecycleState devtools
protocol method to httphandler endpoints.

Change-Id: I1eb66cb3e6c73b55949974fc572456c81ffaeed6

Bug: chromium:837709
Change-Id: I1eb66cb3e6c73b55949974fc572456c81ffaeed6
Reviewed-on: https://chromium-review.googlesource.com/1066395
Commit-Queue: Fadi Meawad <fmeawad@chromium.org>
Reviewed-by: Jonathon Kereliuk <kereliuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565428}