Revert 253057 "Delete run_gpu_test."

The Android bot on the GPU waterfall is still referencing this script.
Will file a new bug about removing the remaining references.

> Delete run_gpu_test.
> 
> It's now run_gpu_test.py in the same directory. This script is unreferenced.
> 
> BUG=321878
> R=zmo@chromium.org
> 
> Review URL: https://codereview.chromium.org/175243005

TBR=kbr@chromium.org

Review URL: https://codereview.chromium.org/178003007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253069 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253069