re-land r254088 (fixed windows compile issue)

General perf tests that measure time to load libraries.

Added tests to measure time to load CDM libraries.

BUG=337674,337674

Review URL: https://codereview.chromium.org/184733004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254802 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254802