[wrapper-tracing] Add tracing to WebGLRenderingContextBase and friends

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 5a43c5286e9bbd186030260b55b07b083d029809..09a23f0821d73aed880d2746210505353e6575ee 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLVertexArrayObjectBase.cpp
+++ b/third_party/WebKit/Source/modules/webgl/WebGLVertexArrayObjectBase.cpp
@@ -151,4 +151,12 @@ DEFINE_TRACE(WebGLVertexArrayObjectBase) {
   WebGLContextObject::trace(visitor);
 }
 
+DEFINE_TRACE_WRAPPERS(WebGLVertexArrayObjectBase) {
+  visitor->traceWrappers(m_boundElementArrayBuffer);
+  for (size_t i = 0; i < m_arrayBufferList.size(); ++i) {
+    visitor->traceWrappers(m_arrayBufferList[i]);
+  }
+  WebGLContextObject::traceWrappers(visitor);
+}
+
 }  // namespace blink