[chromedriver] Add an error autoreporting feature that automatically raises errors from browser logs

BUG=chromedriver:543

Review URL: https://codereview.chromium.org/101203012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245432 0039d316-1c4b-4281-b951-d872f2087c98
[chromedriver] Fix python tests.

BUG=
NOTRY=True

Review URL: https://codereview.chromium.org/131563004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245584 0039d316-1c4b-4281-b951-d872f2087c98