Bind Window focus ability to the ExecutionContext instead of the process.

Source/web/WebScopedWindowFocusAllowedIndicator.cpp

Index: Source/web/WebScopedWindowFocusAllowedIndicator.cpp
diff --git a/Source/web/WebScopedWindowFocusAllowedIndicator.cpp b/Source/web/WebScopedWindowFocusAllowedIndicator.cpp
index 5b2e83aad5962b385e98c132d2bd4b8239c4ac4f..26239b6f59c0d2c221a237fd00ac198fae8a9cd8 100644
--- a/Source/web/WebScopedWindowFocusAllowedIndicator.cpp
+++ b/Source/web/WebScopedWindowFocusAllowedIndicator.cpp
@@ -31,10 +31,20 @@
 #include "config.h"
 #include "public/web/WebScopedWindowFocusAllowedIndicator.h"
 
+#include "core/dom/Document.h"
+#include "core/dom/ScopedWindowFocusAllowedIndicator.h"
 #include "core/page/WindowFocusAllowedIndicator.h"
+#include "public/web/WebDocument.h"
 
 namespace blink {
 
+void WebScopedWindowFocusAllowedIndicator::initialize(WebDocument* webDocument)
+{
+    Document* document = webDocument->unwrap<Document>();
+    ASSERT(document);
+    m_private.reset(new ScopedWindowFocusAllowedIndicator(document));
+}
+
 void WebScopedWindowFocusAllowedIndicator::initialize()
 {
     m_indicator.reset(new WindowFocusAllowedIndicator());
@@ -43,6 +53,7 @@ void WebScopedWindowFocusAllowedIndicator::initialize()
 void WebScopedWindowFocusAllowedIndicator::reset()
 {
     m_indicator.reset(0);
+    m_private.reset(0);
 }
 
 } // namespace blink