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This one contains the required API changes to include service workers in remote debugging.
For now service workers will show up as "untitled" as they do not have a title to speak of.

Split off https://codereview.chromium.org/349033009/

BUG=389454
TBR= mnaganov@chromium.org (android_webview/native/aw_dev_tools_server.cc)

Review URL: https://codereview.chromium.org/459403002

Cr-Commit-Position: refs/heads/master@{#291676}