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Since only one of GL_TEXTURE_2D and GL_TEXTURE_EXTERNAL_OES would be used. Switch active texture according to the target type and unbound the texture after use.
    
BUG=chromium:383414
TEST=Run the unittest on link and peach-pit

Review URL: https://codereview.chromium.org/324253005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277977 0039d316-1c4b-4281-b951-d872f2087c98