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The change enables top level target handler to auto-attach to service worker
when they are created and pause their execution until runIfWaitingForDebugger
is received from the client. This brings service worker functionality on par
with pages and will enable automation tools to configure a service worker
without attaching to every page that may use it.

Design document: https://docs.google.com/document/d/1hbTowhyfrf6CaYuNEHjY_OVx2KgZmnbp8kg_wUdGFiA/edit#

Bug: 1051687
Change-Id: I24ceb9398bce1ab00afbbe427c508e4fa5a7ead5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107792
Commit-Queue: Yury Semikhatsky <yurys@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751417}