Add an iframe permissions= attribute for implementing permission delegation

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

Index: third_party/WebKit/Source/core/html/HTMLIFrameElementSandbox.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLIFrameElementSandbox.cpp b/third_party/WebKit/Source/core/html/HTMLIFrameElementSandbox.cpp
index 8a366af4c5f8544cd8ff28e3241a5478f06b2755..6e5e9cb6c7d35b0564a1a130096fa6e26866d7d2 100644
--- a/third_party/WebKit/Source/core/html/HTMLIFrameElementSandbox.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLIFrameElementSandbox.cpp
@@ -4,39 +4,59 @@
 
 #include "core/html/HTMLIFrameElementSandbox.h"
 
+#include "core/html/HTMLIFrameElement.h"
+
 namespace blink {
 
-HTMLIFrameElementSandbox::HTMLIFrameElementSandbox(DOMTokenListObserver* observer)
-    : DOMTokenList(observer)
+namespace {
+
+const char* kSupportedTokens[] = {
+    "allow-forms",
+    "allow-modals",
+    "allow-pointer-lock",
+    "allow-popups",
+    "allow-popups-to-escape-sandbox",
+    "allow-same-origin",
+    "allow-scripts",
+    "allow-top-navigation"
+};
+
+bool isTokenSupported(const AtomicString& token)
 {
+    for (const char* supportedToken : kSupportedTokens) {
+        if (token == supportedToken)
+            return true;
+    }
+    return false;
 }
 
-HTMLIFrameElementSandbox::~HTMLIFrameElementSandbox()
+} // namespace
+
+HTMLIFrameElementSandbox::HTMLIFrameElementSandbox(HTMLIFrameElement* element)
+    : DOMTokenList(this)
+    , m_element(element)
 {
 }
 
-using SandboxSupportedTokens = HashSet<AtomicString>;
-
-static SandboxSupportedTokens& supportedTokens()
+HTMLIFrameElementSandbox::~HTMLIFrameElementSandbox()
 {
-    DEFINE_STATIC_LOCAL(SandboxSupportedTokens, supportedValues, ());
-    if (supportedValues.isEmpty()) {
-        supportedValues.add("allow-forms");
-        supportedValues.add("allow-modals");
-        supportedValues.add("allow-pointer-lock");
-        supportedValues.add("allow-popups");
-        supportedValues.add("allow-popups-to-escape-sandbox");
-        supportedValues.add("allow-same-origin");
-        supportedValues.add("allow-scripts");
-        supportedValues.add("allow-top-navigation");
-    }
+}
 
-    return supportedValues;
+DEFINE_TRACE(HTMLIFrameElementSandbox)
+{
+    visitor->trace(m_element);
+    DOMTokenList::trace(visitor);
+    DOMTokenListObserver::trace(visitor);
 }
 
 bool HTMLIFrameElementSandbox::validateTokenValue(const AtomicString& tokenValue, ExceptionState&) const
 {
-    return supportedTokens().contains(tokenValue);
+    return isTokenSupported(tokenValue);
+}
+
+void HTMLIFrameElementSandbox::valueWasSet()
+{
+    m_element->sandboxValueWasSet();
 }
 
 } // namespace blink