[telemetry] Implement per-pixel algorithms in Bitmap as a C++ extension.

BUG=323813
TEST=telemetry bitmap_unittest
R=bulach@chromium.org, tonyg@chromium.org

Review URL: https://codereview.chromium.org/108333004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241066 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241066