Add tracing to custom elements operations

third_party/WebKit/Source/core/dom/custom/CustomElementRegistry.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/custom/CustomElementRegistry.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptCustomElementDefinitionBuilder.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/HTMLElementTypeHelpers.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementDefinitionOptions.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/custom/CEReactionsScope.h"
 #include "core/dom/custom/CustomElement.h"
 #include "core/dom/custom/CustomElementDefinition.h"
 #include "core/dom/custom/CustomElementDefinitionBuilder.h"
 #include "core/dom/custom/CustomElementDescriptor.h"
 #include "core/dom/custom/CustomElementUpgradeReaction.h"
 #include "core/dom/custom/CustomElementUpgradeSorter.h"
 #include "core/dom/custom/V0CustomElementRegistrationContext.h"
 #include "core/frame/LocalDOMWindow.h"
+#include "platform/tracing/TraceEvent.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 // Returns true if |name| is invalid.
 static bool throwIfInvalidName(const AtomicString& name,
                                ExceptionState& exceptionState) {
   if (CustomElement::isValidName(name))
     return false;
   exceptionState.throwDOMException(
@@ skipping 62 matching lines @@
   ScriptCustomElementDefinitionBuilder builder(scriptState, this, constructor,
                                                exceptionState);
   define(name, builder, options, exceptionState);
 }
 
 // http://w3c.github.io/webcomponents/spec/custom/#dfn-element-definition
 void CustomElementRegistry::define(const AtomicString& name,
                                    CustomElementDefinitionBuilder& builder,
                                    const ElementDefinitionOptions& options,
                                    ExceptionState& exceptionState) {
+  TRACE_EVENT1("blink", "CustomElementRegistry::define", "name", name.utf8());
   if (!builder.checkConstructorIntrinsics())
     return;
 
   if (throwIfInvalidName(name, exceptionState))
     return;
 
   if (nameIsDefined(name) || v0NameIsDefined(name)) {
     exceptionState.throwDOMException(
         NotSupportedError,
         "this name has already been used with this registry");
@@ skipping 172 matching lines @@
   m_upgradeCandidates->remove(it);
 
   Document* document = m_owner->document();
   if (!document)
     return;
 
   sorter.sorted(elements, document);
 }
 
 }  // namespace blink