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As a step to convert legacy IPCs to the Mojo, this CL
converts renderer side's BlinkTest IPC messages to the Mojo.
This CL adds the IPC messages to WebTestControl interface in
web_test.mojom file. Now it starts to support the original
messages. The added methods are as follow,

 - Reset();
 - TestFinishedInSecondaryRenderer();
 - LayoutDumpCompleted(string completed_layout_dump);
 - ReplyBluetoothManualChooserEvents(array<string> events);

This CL should not change any behavior.

Bug: 1039247
Change-Id: I43dbdbb9d9d4fb20a4f7a55e4e10fbf33e5622ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1991045Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#732323}