GitLab

This roll includes:
  - [inspector_protocol] added StringUtil::toDouble method as requirement [1]

[1] https://codereview.chromium.org/2843223005/

BUG=712610
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2846113002
Cr-Commit-Position: refs/heads/master@{#467878}