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The command generates a .isolate for every compatible gn target.

This will be used by the deterministic builder to check that all isolates
dependencies are identical between two builds.

Change-Id: I4f6a515e49f9cc207dd2f54c796531d12dfeb771
Bug: 870731
Reviewed-on: https://chromium-review.googlesource.com/1176441
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584268}