Replicate static layout test configuration to all renderers.

Currently BlinkTestController sends test configuration whenever the
RenderView gets a new host.  This is insufficient in the long term - we
also need to send test configuration to renderers that do not host the
main frame.  This CL will ensure that OOPIFs will have a correct value
of BlinkTestRunner::is_main_windows_, BlinkTestRunner::test_config_ and
other test flags that stay constant throughout the test.  This CL also
paves the way for replicating dynamic test flags (i.e. dump_as_text or
wait_until_done) across OOPIFs in a future CL (i.e. the work-in-progress
CL at crrev.com/1715573002).

BlinkTestController already tracks all RenderProcessHosts to make sure
it can detect a crash not only in the main frame, but also in OOPIFs.
This CL extends this tracking to also send test configuration to new
RenderProcessHosts.  The first message in a test will be a
ShellViewMsg_SetTestConfiguration;  all subsequent renderers get
ShellViewMsg_ReplicateTestConfiguration (differentiation is needed to
avoid executing test initialization activities twice).

The test configuration ultimately needs to reach a BlinkTestRunner
instance in a specific RenderProcess.  The CL accomplishes this by
sending a message to a RenderFrame known to be present in a new
RenderProcess - the message is received by LayoutTestRenderFrameObserver
and forwarded to the BlinkTestRunner singleton in the current process.
Other alternatives have been ruled out:
- Sending a message to a RenderView in a specific process is not
  possible outside of //content internals.
- There is no way for BlinkTestRunner to intercept a message to a
  RenderProcess.

The CL reuses BlinkTestController::send_configuration_to_next_host_
field to track whether it has already send the test configuration
to any render hosts.  The new code seems consistent with the spirit
of https://crrev.com/12595002 which introduced this field.

BUG=587175

Review URL: https://codereview.chromium.org/1750063002

Cr-Commit-Position: refs/heads/master@{#379992}

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