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This fixes a bunch of small nits:
* JSCompile is now enabled for this app.
* No need to manually focus the PNaCl plugin.
* Distinguishes between left and right modifiers for PNaCl events.
* Debug log is hidden by default, and selectable when shown.
* Minor CSS tweaks and code clean-up.

Review URL: https://codereview.chromium.org/900983003

Cr-Commit-Position: refs/heads/master@{#314674}