Replaced '.' with '_' for some of the conformance/glsl/implicit test names.

Makes them conform to gtest format.

BUG=225939
R=bajones@chromium.org

Review URL: https://codereview.chromium.org/26631007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227846 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227846