[wrapper-tracing] Add tracing to WebGLRenderingContextBase and friends

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

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
index 5c875a281eaa1989a87c9b3ade362301eeeda046..a3194c768825fdf08483c5752363f56a4baeab3b 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
@@ -7461,6 +7461,28 @@ DEFINE_TRACE(WebGLRenderingContextBase) {
   CanvasRenderingContext::trace(visitor);
 }
 
+DEFINE_TRACE_WRAPPERS(WebGLRenderingContextBase) {
+  if (isContextLost()) {
+    return;
+  }
+  visitor->traceWrappers(m_boundArrayBuffer);
+  visitor->traceWrappers(m_renderbufferBinding);
+  visitor->traceWrappers(m_framebufferBinding);
+  visitor->traceWrappers(m_currentProgram);
+  visitor->traceWrappers(m_boundVertexArrayObject);
+  for (auto& unit : m_textureUnits) {
+    visitor->traceWrappers(unit.m_texture2DBinding);
+    visitor->traceWrappers(unit.m_textureCubeMapBinding);
+    visitor->traceWrappers(unit.m_texture3DBinding);
+    visitor->traceWrappers(unit.m_texture2DArrayBinding);
+  }
+  for (ExtensionTracker* tracker : m_extensions) {
+    WebGLExtension* extension = tracker->getExtensionObjectIfAlreadyEnabled();
+    visitor->traceWrappers(extension);
+  }
+  CanvasRenderingContext::traceWrappers(visitor);
+}
+
 int WebGLRenderingContextBase::externallyAllocatedBytesPerPixel() {
   if (isContextLost())
     return 0;