Add console messages when modals are suppressed due to sandboxing.

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 769 matching lines @@
 {
     if (!frame())
         return;
 
     FrameHost* host = frame()->host();
     if (!host)
         return;
 
     if (frame()->document()->isSandboxed(SandboxModals)) {
         UseCounter::count(frame()->document(), UseCounter::DialogInSandboxedContext);
-        if (RuntimeEnabledFeatures::sandboxBlocksModalsEnabled())
+        if (RuntimeEnabledFeatures::sandboxBlocksModalsEnabled()) {
+            frameConsole()->addMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Ignored call to 'print()'. The document is sandboxed, and the 'allow-modals' keyword is not set."));
             return;
+        }
     }
 
     if (frame()->isLoading()) {
         m_shouldPrintWhenFinishedLoading = true;
         return;
     }
     m_shouldPrintWhenFinishedLoading = false;
     host->chromeClient().print(frame());
 }
 
 void LocalDOMWindow::stop()
 {
     if (!frame())
         return;
     frame()->loader().stopAllLoaders();
 }
 
 void LocalDOMWindow::alert(const String& message)
 {
     if (!frame())
         return;
 
     if (frame()->document()->isSandboxed(SandboxModals)) {
         UseCounter::count(frame()->document(), UseCounter::DialogInSandboxedContext);
-        if (RuntimeEnabledFeatures::sandboxBlocksModalsEnabled())
+        if (RuntimeEnabledFeatures::sandboxBlocksModalsEnabled()) {
+            frameConsole()->addMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Ignored call to 'alert()'. The document is sandboxed, and the 'allow-modals' keyword is not set."));
             return;
+        }
     }
 
     frame()->document()->updateLayoutTreeIfNeeded();
 
     FrameHost* host = frame()->host();
     if (!host)
         return;
 
     host->chromeClient().openJavaScriptAlert(frame(), message);
 }
 
 bool LocalDOMWindow::confirm(const String& message)
 {
     if (!frame())
         return false;
 
     if (frame()->document()->isSandboxed(SandboxModals)) {
         UseCounter::count(frame()->document(), UseCounter::DialogInSandboxedContext);
-        if (RuntimeEnabledFeatures::sandboxBlocksModalsEnabled())
+        if (RuntimeEnabledFeatures::sandboxBlocksModalsEnabled()) {
+            frameConsole()->addMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Ignored call to 'confirm()'. The document is sandboxed, and the 'allow-modals' keyword is not set."));
             return false;
+        }
     }
 
     frame()->document()->updateLayoutTreeIfNeeded();
 
     FrameHost* host = frame()->host();
     if (!host)
         return false;
 
-    if (frame()->document()->isSandboxed(SandboxModals)) {
-        UseCounter::count(frame()->document(), UseCounter::DialogInSandboxedContext);
-        if (RuntimeEnabledFeatures::sandboxBlocksModalsEnabled())
-            return false;
-    }
-
     return host->chromeClient().openJavaScriptConfirm(frame(), message);
 }
 
 String LocalDOMWindow::prompt(const String& message, const String& defaultValue)
 {
     if (!frame())
         return String();
 
     if (frame()->document()->isSandboxed(SandboxModals)) {
         UseCounter::count(frame()->document(), UseCounter::DialogInSandboxedContext);
-        if (RuntimeEnabledFeatures::sandboxBlocksModalsEnabled())
+        if (RuntimeEnabledFeatures::sandboxBlocksModalsEnabled()) {
+            frameConsole()->addMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Ignored call to 'prompt()'. The document is sandboxed, and the 'allow-modals' keyword is not set."));
             return String();
+        }
     }
 
     frame()->document()->updateLayoutTreeIfNeeded();
 
     FrameHost* host = frame()->host();
     if (!host)
         return String();
 
     String returnValue;
     if (host->chromeClient().openJavaScriptPrompt(frame(), message, defaultValue, returnValue))
@@ skipping 629 matching lines @@
     DOMWindow::trace(visitor);
     DOMWindowLifecycleNotifier::trace(visitor);
 }
 
 LocalFrame* LocalDOMWindow::frame() const
 {
     return m_frameObserver->frame();
 }
 
 } // namespace blink