[wrapper-tracing] WebGL and friends: Add write barriers

third_party/WebKit/Source/modules/webgl/WebGLProgram.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
 
 WebGLProgram* WebGLProgram::create(WebGLRenderingContextBase* ctx) {
   return new WebGLProgram(ctx);
 }
 
 WebGLProgram::WebGLProgram(WebGLRenderingContextBase* ctx)
     : WebGLSharedPlatform3DObject(ctx),
       m_linkStatus(false),
       m_linkCount(0),
       m_activeTransformFeedbackCount(0),
+      m_vertexShader(this, nullptr),
+      m_fragmentShader(this, nullptr),
       m_infoValid(true) {
   setObject(ctx->contextGL()->CreateProgram());
 }
 
 WebGLProgram::~WebGLProgram() {
   // These heap objects handle detachment on their own. Clear out
   // the references to prevent deleteObjectImpl() from trying to do
   // same, as we cannot safely access other heap objects from this
   // destructor.
   m_vertexShader = nullptr;
@@ skipping 109 matching lines @@
   WebGLSharedPlatform3DObject::trace(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS(WebGLProgram) {
   visitor->traceWrappers(m_vertexShader);
   visitor->traceWrappers(m_fragmentShader);
   WebGLSharedPlatform3DObject::traceWrappers(visitor);
 }
 
 }  // namespace blink