GitLab

* Implement Frame.GetRemoteDebuggingPort.
* Move all remote debugging handling in the Context process to
  WebEngineRemoteDebugging.
* Change the debug DevTools behavior to not fallback on attempting to
  listen on IPv6 localhost in case of failure on IPv4 localhost.
* Refactor the GetDevToolsListFromPort() test utility out of
  WebEngineDebugIntegrationTest to be shared with
  WebEngineIntegrationTest.
* Fix a potential issue when the DevTools service fails to start and
  the debug DevTools listeners were not notified. In ContextImpl, the
  OnDevToolsPortReady() callback was only called when the DevTools
  service opened. It is now systematically called during browser
  process start-up and |devtools_port_received_| keeps track of that
  call in ContextImpl, rather than assuming a 0 value for
  |devtools_port_| means the service start was never requested.

Bug: 973268
Change-Id: I58d15c0656ebe1adfe6c254e4aefc0c7bfd54176
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1670441Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676208}