Measure the usage of cross-origin modal dialogs.

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 746 matching lines @@
         if (RuntimeEnabledFeatures::disableBlockingMethodsDuringMicrotasksEnabled()) {
             frameConsole()->addMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Ignored call to 'print()' during microtask execution."));
             return;
         }
     }
 
     if (frame()->isLoading()) {
         m_shouldPrintWhenFinishedLoading = true;
         return;
     }
+
+    if (frame()->isCrossOrigin()) {

[dcheng, 2016/06/21 11:20:02]

Nit: no { } around a single-line conditional body

+        UseCounter::count(frame()->document(), UseCounter::CrossOriginWindowPrint);
+    }
     m_shouldPrintWhenFinishedLoading = false;
     host->chromeClient().print(frame());
 }
 
 void LocalDOMWindow::stop()
 {
     if (!frame())
         return;
     frame()->loader().stopAllLoaders();
 }
@@ skipping 18 matching lines @@
             return;
         }
     }
 
     frame()->document()->updateStyleAndLayoutTree();
 
     FrameHost* host = frame()->host();
     if (!host)
         return;
 
+    if (frame()->isCrossOrigin()) {
+        UseCounter::count(frame()->document(), UseCounter::CrossOriginWindowAlert);
+    }
+
     host->chromeClient().openJavaScriptAlert(frame(), message);
 }
 
 bool LocalDOMWindow::confirm(ScriptState* scriptState, const String& message)
 {
     if (!frame())
         return false;
 
     if (frame()->document()->isSandboxed(SandboxModals)) {
         UseCounter::count(frame()->document(), UseCounter::DialogInSandboxedContext);
@@ skipping 10 matching lines @@
             return false;
         }
     }
 
     frame()->document()->updateStyleAndLayoutTree();
 
     FrameHost* host = frame()->host();
     if (!host)
         return false;
 
+    if (frame()->isCrossOrigin()) {
+        UseCounter::count(frame()->document(), UseCounter::CrossOriginWindowConfirm);
+    }
     return host->chromeClient().openJavaScriptConfirm(frame(), message);
 }
 
 String LocalDOMWindow::prompt(ScriptState* scriptState, const String& message, const String& defaultValue)
 {
     if (!frame())
         return String();
 
     if (frame()->document()->isSandboxed(SandboxModals)) {
         UseCounter::count(frame()->document(), UseCounter::DialogInSandboxedContext);
@@ skipping 14 matching lines @@
     frame()->document()->updateStyleAndLayoutTree();
 
     FrameHost* host = frame()->host();
     if (!host)
         return String();
 
     String returnValue;
     if (host->chromeClient().openJavaScriptPrompt(frame(), message, defaultValue, returnValue))
         return returnValue;
 
+    if (frame()->isCrossOrigin()) {
+        UseCounter::count(frame()->document(), UseCounter::CrossOriginWindowPrompt);
+    }
+
     return String();
 }
 
 bool LocalDOMWindow::find(const String& string, bool caseSensitive, bool backwards, bool wrap, bool wholeWord, bool /*searchInFrames*/, bool /*showDialog*/) const
 {
     if (!isCurrentlyDisplayedInFrame())
         return false;
 
     // FIXME (13016): Support searchInFrames and showDialog
     FindOptions options = (backwards ? Backwards : 0) | (caseSensitive ? 0 : CaseInsensitive) | (wrap ? WrapAround : 0) | (wholeWord ? WholeWord | AtWordStarts : 0);
@@ skipping 674 matching lines @@
 {
     // If the LocalDOMWindow still has a frame reference, that frame must point
     // back to this LocalDOMWindow: otherwise, it's easy to get into a situation
     // where script execution leaks between different LocalDOMWindows.
     if (m_frameObserver->frame())
         ASSERT_WITH_SECURITY_IMPLICATION(m_frameObserver->frame()->domWindow() == this);
     return m_frameObserver->frame();
 }
 
 } // namespace blink