Add initial Screen Orientation API support: IDL changes

Source/core/frame/Screen.cpp

Index: Source/core/frame/Screen.cpp
diff --git a/Source/core/frame/Screen.cpp b/Source/core/frame/Screen.cpp
index bc9184948bc1c3b855ce513e74aa6c43951dbfec..67283acac6e3be568a25bbdd4a14b3cf687d2ee9 100644
--- a/Source/core/frame/Screen.cpp
+++ b/Source/core/frame/Screen.cpp
@@ -120,4 +120,16 @@ unsigned Screen::availWidth() const
     return static_cast<unsigned>(screenAvailableRect(m_frame->view()).width());
 }
 
+const AtomicString& Screen::interfaceName() const
+{
+    return EventTargetNames::Screen;
+}
+
+ExecutionContext* Screen::executionContext() const
+{
+    if (!m_frame)
+        return 0;

[Inactive, 2014/02/16 02:01:57]

You asked about the risk of returning 0 here. I actually used the same
implementation I found in other places (e.g. Performance or ApplicationCache).

I looked at the callers of executionContext(), e.g. in EventTarget.cpp, and they
seem to have null checks in place.

[abarth-chromium, 2014/02/16 04:03:48]

Thanks!

+    return m_frame->document();
+}
+
 } // namespace WebCore