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 383452736099fe4650baf8e677161e5c7e3b4a9b..503fff02065601a8ee43d1cf6e65fedfcf0e0fcf 100644
--- a/gpu/command_buffer/client/gles2_c_lib_autogen.h
+++ b/gpu/command_buffer/client/gles2_c_lib_autogen.h
@@ -676,6 +676,13 @@ 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);
 }
@@ -1837,6 +1844,10 @@ extern const NameToFunc g_gles2_function_table[] = {
      reinterpret_cast<GLES2FunctionPointer>(glTexSubImage3D),
     },
     {
+     "glTransformFeedbackVaryings",
+     reinterpret_cast<GLES2FunctionPointer>(glTransformFeedbackVaryings),
+    },
+    {
      "glUniform1f",
      reinterpret_cast<GLES2FunctionPointer>(glUniform1f),
     },