Workaround Linux AMD driver bug where TEXTURE_MAX_ANISOTROPY init value is incorrect.

So the first time we query this for a texture, we init it to 1 first before querying.

BUG=348237
TEST=webgl conformance tests on Linux AMD, gpu_unittests
R=bajones@chromium.org, kbr@chromium.org

Review URL: https://codereview.chromium.org/182413006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254885 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254885