Upgrade in-document custom elements when an element is defined.

third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.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/CustomElementDefinition.h"
 
 namespace blink {
 
 CustomElementDefinition::CustomElementDefinition(
     const CustomElementDescriptor& descriptor)
     : m_descriptor(descriptor)
 {
 }
 
 CustomElementDefinition::~CustomElementDefinition()
 {
 }
 
+DEFINE_TRACE(CustomElementDefinition)
+{
+    visitor->trace(m_constructionStack);
+}
+
+// https://html.spec.whatwg.org/multipage/scripting.html#concept-upgrade-an-element
+void CustomElementDefinition::upgrade(Element* element)
+{
+    size_t depth = m_constructionStack.size();
+    m_constructionStack.append(element);

[yosin_UTC9, 2016/06/01 06:15:44]

We should have DCHECK(!m_constructionStack.isEmpty());

[dominicc (has gone to gerrit), 2016/06/01 23:30:56]

Why? How would anything get upgraded if there's an assertion that the stack is
not-empty before pushing onto the stack--how would the first element get on
there?

[yosin_UTC9, 2016/06/02 02:02:18]

Sorry, my comment is wrong.

+
+    bool succeeded = runConstructor(element);
+
+    // Pop the construction stack.
+    DCHECK(m_constructionStack.last() == element

[yosin_UTC9, 2016/06/01 06:15:44]

Better to use DCHECK_EQ
if (!m_consturctionStack.last())
  DCHECK_EQ(m_constructionStack.last(), element)

[dominicc (has gone to gerrit), 2016/06/01 23:30:57]

I don't think that's applicable because of the test on line 34 which also allows
the TOS to be nullptr.

[yosin_UTC9, 2016/06/02 02:02:18]

Oh, typo

if (m_consturctionStack.last())
   DCHECK_EQ(m_constructionStack.last(), element)

+        || !m_constructionStack.last());
+    m_constructionStack.removeLast();
+    DCHECK(m_constructionStack.size() == depth); // It's a *stack*.

[yosin_UTC9, 2016/06/01 06:15:44]

nit: DCHECK_EQ

+
+    if (!succeeded)
+        return;
+
+    // TODO(dominicc): Turn this into an assertion when setting
+    // 'custom' moves to the HTMLElement constructor. We will need to
+    // add a bit for MARQUEE to be custom-gets-callbacks-yet-not-custom.
+    element->setCustomElementState(CustomElementState::Custom);
+
+    // TODO(dominicc): When the attributeChangedCallback is implemented,
+    // enqueue reactions for attributes here.
+    // TODO(dominicc): When the connectedCallback is implemented, enqueue
+    // reactions here, if applicable.
+}
+
 } // namespace blink