Fix SafeAdd and SafeMultiply

BUG=145648,145544


Review URL: https://chromiumcodereview.appspot.com/10916165

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@155478 0039d316-1c4b-4281-b951-d872f2087c98
GLenum GLES2DecoderImpl::PeekGLError() {
  GLenum error = glGetError();
  if (error != GL_NO_ERROR) {
    SetGLError(error, "", "");
  }
  return error;
}

GLenum GLES2DecoderImpl::PeekGLError() {
  GLenum error = glGetError();
  if (error != GL_NO_ERROR) {
    SetGLError(error, "", "");
  }
  return error;
}
