Add metrics for usage of permission features from iframes in blink

third_party/WebKit/Source/core/frame/UseCounter.cpp

 /*
  * Copyright (C) 2012 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 712 matching lines @@
     UseCounter::countDeprecation(document.frame(), feature);
 }
 
 void UseCounter::countDeprecationIfNotPrivateScript(v8::Isolate* isolate, ExecutionContext* context, Feature feature)
 {
     if (DOMWrapperWorld::current(isolate).isPrivateScriptIsolatedWorld())
         return;
     UseCounter::countDeprecation(context, feature);
 }
 
+void UseCounter::countCrossOriginIframe(const Document& document, Feature feature)
+{
+    Frame* frame = document.frame();
+    if (!frame)
+        return;
+    // Check to see if the frame can script into the top level document.
+    SecurityOrigin* securityOrigin = frame->securityContext()->securityOrigin();
+    Frame* top = frame->tree().top();
+    if (top && !securityOrigin->canAccess(top->securityContext()->securityOrigin()))
+        count(frame, feature);
+}
+
 static const char* milestoneString(int milestone)
 {
     switch (milestone) {
     case 50:
         return "M50, around April 2016";
     case 53:
         return "M53, around September 2016";
     }
 
     ASSERT_NOT_REACHED();
@@ skipping 269 matching lines @@
 UseCounter* UseCounter::getFrom(const StyleSheetContents* sheetContents)
 {
     // FIXME: We may want to handle stylesheets that have multiple owners
     //        https://crbug.com/242125
     if (sheetContents && sheetContents->hasSingleOwnerNode())
         return getFrom(sheetContents->singleOwnerDocument());
     return 0;
 }
 
 } // namespace blink