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As a step to convert legacy IPCs to the Mojo, this CL
converts browser side's BlinkTest IPCs to Mojo. This
CL introduces WebTestClient interface to replace the
IPC messages to Mojo methods in web_test.mojom file.
The interface starts to support the original messages
as below,

 - InitiateLayoutDump()
 - PrintMessageToStderr()
 - SetPopupBlockingEnabled()
 - NavigateSecondaryWindow()
 - GoToOffset
 - Reload()
 - LoadURLForFrame()
 - CloseRemainingWindows()
 - ResetDone()
 - SendBluetoothManualChooserEvent()
 - GetBluetoothManualChooserEvents()
 - SetBluetoothManualChooser()

This CL should not change any behavior.

Bug: 1039247
Change-Id: Ic30f8cc0cb19ec8a306b577f3c10567d91bdccf1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002047Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#732388}