Fix glGetFramebufferAttachmentParameteriv so it returns
current names for buffers.

TEST=unit_tests and conformance tests
BUG=none

Review URL: http://codereview.chromium.org/3135003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55831 0039d316-1c4b-4281-b951-d872f2087c98
  const int8* GetPixelAddress(GLint x, GLint y) const {
    return pixels_ + (width_ * y + x) * bytes_per_pixel_;
  }

  const int8* GetPixelAddress(GLint x, GLint y) const {
    return pixels_ + (width_ * y + x) * bytes_per_pixel_;
  }
