GitLab

Add more options to uberblame

* Adds --tokenize-by-character
  * This is useful for eg. the blink refactor where fooBar got changed to
    foo_bar.
* Adds --tokenize-whitespace
* Adds --skip-visualization
  * Added this because it was useful for testing.
* Ran yapf
* Small refactor.

BUG=773350
R=dpranke

Change-Id: I7596f670ce640ed6bd367dee995628edc13dd6f2
Reviewed-on: https://chromium-review.googlesource.com/1010798Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550634}