Fire attributeChangedCallback on style changes for Custom Elements V1

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

Index: third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp b/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp
index e0567a9029abf1241defa983378311411da865fd..b5666d53ed97670c8d1a7ee19172d42d9e5f42c1 100644
--- a/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.cpp
@@ -24,8 +24,10 @@ CustomElementDefinition::CustomElementDefinition(
 CustomElementDefinition::CustomElementDefinition(
     const CustomElementDescriptor& descriptor,
     const HashSet<AtomicString>& observedAttributes)
-    : m_observedAttributes(observedAttributes)
-    , m_descriptor(descriptor)
+    : m_descriptor(descriptor)
+    , m_observedAttributes(observedAttributes)
+    , m_hasStyleAttributeChangedCallback(
+        observedAttributes.contains(HTMLNames::styleAttr.localName()))
 {
 }
 
@@ -127,11 +129,16 @@ void CustomElementDefinition::upgrade(Element* element)
 }
 
 bool CustomElementDefinition::hasAttributeChangedCallback(
-    const QualifiedName& name)
+    const QualifiedName& name) const
 {
     return m_observedAttributes.contains(name.localName());
 }
 
+bool CustomElementDefinition::hasStyleAttributeChangedCallback() const
+{
+    return m_hasStyleAttributeChangedCallback;
+}
+
 void CustomElementDefinition::enqueueUpgradeReaction(Element* element)
 {
     CustomElement::enqueue(element,