Implement 'window.isSecureContext'.

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

Index: third_party/WebKit/Source/core/frame/DOMWindow.cpp
diff --git a/third_party/WebKit/Source/core/frame/DOMWindow.cpp b/third_party/WebKit/Source/core/frame/DOMWindow.cpp
index b514d469fe941be440f78783a670567f6b5e445a..cde4794c276d649f13df88e5be26bec7db22b11b 100644
--- a/third_party/WebKit/Source/core/frame/DOMWindow.cpp
+++ b/third_party/WebKit/Source/core/frame/DOMWindow.cpp
@@ -8,6 +8,7 @@
 #include "bindings/core/v8/ScriptCallStackFactory.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/dom/ExecutionContext.h"
 #include "core/dom/SecurityContext.h"
 #include "core/events/MessageEvent.h"
 #include "core/frame/Frame.h"
@@ -155,6 +156,15 @@ void DOMWindow::resetLocation()
     }
 }
 
+bool DOMWindow::isSecureContext() const
+{
+    if (!frame())
+        return false;
+
+    String unusedErrorMessage;
+    return document()->isSecureContext(unusedErrorMessage, ExecutionContext::StandardSecureContextCheck);
+}
+
 void DOMWindow::postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, const String& targetOrigin, LocalDOMWindow* source, ExceptionState& exceptionState)
 {
     if (!isCurrentlyDisplayedInFrame())