Ensure the permissions DOMTokenList is initialized before access

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

Index: third_party/WebKit/Source/core/html/HTMLIFrameElementTest.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLIFrameElementTest.cpp b/third_party/WebKit/Source/core/html/HTMLIFrameElementTest.cpp
index 2f8bf21410218febad52c5e4113829067f496811..a79701c63b3805819eb4799e2bdffb34d17e961c 100644
--- a/third_party/WebKit/Source/core/html/HTMLIFrameElementTest.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLIFrameElementTest.cpp
@@ -9,18 +9,24 @@
 
 namespace blink {
 
+// Test setting via the Element attribute (HTML codepath).
 TEST(HTMLIFrameElementTest, SetPermissionsAttribute)
 {
     Document* document = Document::create();
     HTMLIFrameElement* iframe = HTMLIFrameElement::create(*document);
 
-    // Test setting via the Element attribute (HTML codepath).
     iframe->setAttribute(HTMLNames::permissionsAttr, "geolocation");
     EXPECT_EQ("geolocation", iframe->permissions()->value());
     iframe->setAttribute(HTMLNames::permissionsAttr, "geolocation notifications");
     EXPECT_EQ("geolocation notifications", iframe->permissions()->value());
+}
+
+// Test setting via the DOMTokenList (JS codepath).
+TEST(HTMLIFrameElementTest, SetPermissionsAttributeJS)
+{
+    Document* document = Document::create();
+    HTMLIFrameElement* iframe = HTMLIFrameElement::create(*document);
 
-    // Test setting via the DOMTokenList (JS codepath).
     iframe->permissions()->setValue("midi");
     EXPECT_EQ("midi", iframe->getAttribute(HTMLNames::permissionsAttr));
 }