Add glTransformFeedbackVaryings to GPU command buffer.

gpu/command_buffer/client/gles2_interface_autogen.h

Index: gpu/command_buffer/client/gles2_interface_autogen.h
diff --git a/gpu/command_buffer/client/gles2_interface_autogen.h b/gpu/command_buffer/client/gles2_interface_autogen.h
index fe0da5b6b3bb5e4076944920436c1b681ce9467d..117e35cd1266b3488af4c3fa3c54c1a550608006 100644
--- a/gpu/command_buffer/client/gles2_interface_autogen.h
+++ b/gpu/command_buffer/client/gles2_interface_autogen.h
@@ -364,6 +364,10 @@ virtual void TexSubImage3D(GLenum target,
                            GLenum format,
                            GLenum type,
                            const void* pixels) = 0;
+virtual void TransformFeedbackVaryings(GLuint program,
+                                       GLsizei count,
+                                       const char* const* varyings,
+                                       GLenum buffermode) = 0;
 virtual void Uniform1f(GLint location, GLfloat x) = 0;
 virtual void Uniform1fv(GLint location, GLsizei count, const GLfloat* v) = 0;
 virtual void Uniform1i(GLint location, GLint x) = 0;