Add an iframe permissions= attribute for implementing permission delegation

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 61b06a393572f1e03d12b0c31684176cb9adc66a..cb505efc816098d156bd49a856750f2cb47afbd2 100644
--- a/third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp
@@ -39,6 +39,7 @@ inline HTMLIFrameElement::HTMLIFrameElement(Document& document)
     : HTMLFrameElementBase(iframeTag, document)
     , m_didLoadNonEmptyDocument(false)
     , m_sandbox(HTMLIFrameElementSandbox::create(this))
+    , m_permissions(HTMLIFrameElementPermissions::create(this))

[sof, 2016/06/27 08:38:52]

As this isn't commonly accessed (or enabled by default), could we lazily create
|m_permissions| ?

[raymes, 2016/06/28 01:19:03]

Done.

     , m_referrerPolicy(ReferrerPolicyDefault)
 {
 }
@@ -48,8 +49,8 @@ DEFINE_NODE_FACTORY(HTMLIFrameElement)
 DEFINE_TRACE(HTMLIFrameElement)
 {
     visitor->trace(m_sandbox);
+    visitor->trace(m_permissions);
     HTMLFrameElementBase::trace(visitor);
-    DOMTokenListObserver::trace(visitor);
 }
 
 HTMLIFrameElement::~HTMLIFrameElement()
@@ -61,6 +62,11 @@ DOMTokenList* HTMLIFrameElement::sandbox() const
     return m_sandbox.get();
 }
 
+DOMTokenList* HTMLIFrameElement::permissions() const
+{
+    return m_permissions.get();
+}
+
 bool HTMLIFrameElement::isPresentationAttribute(const QualifiedName& name) const
 {
     if (name == widthAttr || name == heightAttr || name == alignAttr || name == frameborderAttr)
@@ -109,6 +115,8 @@ void HTMLIFrameElement::parseAttribute(const QualifiedName& name, const AtomicSt
         m_allowFullscreen = !value.isNull();
         if (m_allowFullscreen != oldAllowFullscreen)
             frameOwnerPropertiesChanged();
+    } else if (name == permissionsAttr) {
+        m_permissions->setValue(value);
     } else {
         if (name == srcAttr)
             logUpdateAttributeIfIsolatedWorldAndInDocument("iframe", srcAttr, oldValue, value);
@@ -147,7 +155,20 @@ bool HTMLIFrameElement::isInteractiveContent() const
     return true;
 }
 
-void HTMLIFrameElement::valueWasSet()
+void HTMLIFrameElement::permissionsValueWasSet()
+{
+    if (!RuntimeEnabledFeatures::permissionDelegationEnabled())
+        return;
+
+    String invalidTokens;
+    m_delegatedPermissions = m_permissions->parseDelegatedPermissions(invalidTokens);
+    if (!invalidTokens.isNull())
+        document().addConsoleMessage(ConsoleMessage::create(OtherMessageSource, ErrorMessageLevel, "Error while parsing the 'permissions' attribute: " + invalidTokens));
+    setSynchronizedLazyAttribute(permissionsAttr, m_permissions->value());
+    frameOwnerPropertiesChanged();
+}
+
+void HTMLIFrameElement::sandboxValueWasSet()
 {
     String invalidTokens;
     setSandboxFlags(m_sandbox->value().isNull() ? SandboxNone : parseSandboxPolicy(m_sandbox->tokens(), invalidTokens));