Add glTransformFeedbackVaryings to GPU command buffer.

gpu/command_buffer/client/gles2_c_lib_autogen.h

Index: gpu/command_buffer/client/gles2_c_lib_autogen.h
diff --git a/gpu/command_buffer/client/gles2_c_lib_autogen.h b/gpu/command_buffer/client/gles2_c_lib_autogen.h
index cd3bd7fd26eaf04fdaaa499bcc37eb54b3274147..f2ee3a8f4750eb82f3570a6d78672b2a5f047ff3 100644
--- a/gpu/command_buffer/client/gles2_c_lib_autogen.h
+++ b/gpu/command_buffer/client/gles2_c_lib_autogen.h
@@ -661,6 +661,13 @@ void GLES2TexSubImage3D(GLenum target,
                                        width, height, depth, format, type,
                                        pixels);
 }
+void GLES2TransformFeedbackVaryings(GLuint program,
+                                    GLsizei count,
+                                    const char* const* varyings,
+                                    GLenum buffermode) {
+  gles2::GetGLContext()->TransformFeedbackVaryings(program, count, varyings,
+                                                   buffermode);
+}
 void GLES2Uniform1f(GLint location, GLfloat x) {
   gles2::GetGLContext()->Uniform1f(location, x);
 }
@@ -1814,6 +1821,10 @@ extern const NameToFunc g_gles2_function_table[] = {
      reinterpret_cast<GLES2FunctionPointer>(glTexSubImage3D),
     },
     {
+     "glTransformFeedbackVaryings",
+     reinterpret_cast<GLES2FunctionPointer>(glTransformFeedbackVaryings),
+    },
+    {
      "glUniform1f",
      reinterpret_cast<GLES2FunctionPointer>(glUniform1f),
     },