[DO NOT SUBMIT] Support allowpaymentrequest with out-of-process iframes

third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp b/third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp
index 8639371580f6b674fdbf6694cd91f082e9161dea..150abce01a41f02c68df76908978335e0404230b 100644
--- a/third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp
@@ -120,6 +120,11 @@ void HTMLIFrameElement::parseAttribute(const QualifiedName& name,
     m_allowFullscreen = !value.isNull();
     if (m_allowFullscreen != oldAllowFullscreen)
       frameOwnerPropertiesChanged();
+  } else if (name == allowpaymentrequestAttr) {
+    bool oldAllowPaymentRequest = m_allowPaymentRequest;
+    m_allowPaymentRequest = !value.isNull();
+    if (m_allowPaymentRequest != oldAllowPaymentRequest)
+      frameOwnerPropertiesChanged();
   } else if (name == permissionsAttr) {
     if (initializePermissionsAttribute())
       m_permissions->setValue(value);