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

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

Index: third_party/WebKit/Source/modules/webgl/WebGLVertexArrayObjectBase.cpp
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLVertexArrayObjectBase.cpp b/third_party/WebKit/Source/modules/webgl/WebGLVertexArrayObjectBase.cpp
index 09a23f0821d73aed880d2746210505353e6575ee..86a1b2a3870f3f042c41da2298c51040166606bd 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLVertexArrayObjectBase.cpp
+++ b/third_party/WebKit/Source/modules/webgl/WebGLVertexArrayObjectBase.cpp
@@ -17,7 +17,7 @@ WebGLVertexArrayObjectBase::WebGLVertexArrayObjectBase(
       m_type(type),
       m_hasEverBeenBound(false),
       m_destructionInProgress(false),
-      m_boundElementArrayBuffer(nullptr),
+      m_boundElementArrayBuffer(this, nullptr),
       m_isAllEnabledAttribBufferBound(true) {
   m_arrayBufferList.resize(ctx->maxVertexAttribs());
   m_attribEnabled.resize(ctx->maxVertexAttribs());
@@ -94,7 +94,7 @@ void WebGLVertexArrayObjectBase::setArrayBufferForAttrib(GLuint index,
   if (m_arrayBufferList[index])
     m_arrayBufferList[index]->onDetached(context()->contextGL());
 
-  m_arrayBufferList[index] = buffer;
+  m_arrayBufferList[index] = TraceWrapperMember<WebGLBuffer>(this, buffer);
   updateAttribBufferBoundStatus();
 }