Expose the glBindUniformLocationCHROMIUM extension to Skia.
Fixed some code that should be behind #if GR_GL_PER_GL_FUNC_CALLBACK.

R=kbr

Review URL: https://codereview.chromium.org/66553005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234718 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234718