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This change populates the feedback dialog with some initial info, including profile email and current URL, by adding a new WebUI Message Handler for C++ <-> JS messaging. The handler will be build out to support more messaging in the future, e.g. system info, screenshots, and feedback submission.

BUG=632112

Review-Url: https://codereview.chromium.org/2190653003
Cr-Commit-Position: refs/heads/master@{#418977}