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- Add modules.
- Misc additions to the dictionary (based on the coverage report).
- Pass the command line flags to V8 (for debugging purposes).

Bug: 
Change-Id: Ic0777906cbfd86f1c551df33b7af95e0a5a26b0f
Reviewed-on: https://chromium-review.googlesource.com/727806Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510084}