Implement navigator.mediaDevices.getUserMedia()

Source/modules/mediastream/MediaDevices.h

Index: Source/modules/mediastream/MediaDevices.h
diff --git a/Source/modules/mediastream/MediaDevices.h b/Source/modules/mediastream/MediaDevices.h
index ba26231c07cf87be3ac3e944a28d58ff8c8184f5..2ea0fccec9e3537b8219b148768a804aeb693954 100644
--- a/Source/modules/mediastream/MediaDevices.h
+++ b/Source/modules/mediastream/MediaDevices.h
@@ -10,6 +10,7 @@
 
 namespace blink {
 
+class Dictionary;
 class ScriptState;
 
 class MediaDevices final : public GarbageCollected<MediaDevices>, public ScriptWrappable {
@@ -21,7 +22,7 @@ public:
     }
 
     ScriptPromise enumerateDevices(ScriptState*);
-
+    ScriptPromise getUserMedia(ScriptState*, const Dictionary&, ExceptionState&);

[Peter Beverloo, 2015/06/23 12:44:16]

At some point it would be interesting to see if we can change this from being a
random Dictionary to being a defined one, see for example
NotificationOptions.idl. 

That'd be out of scope for this patch, however.

[hta - Chromium, 2015/06/26 09:28:59]

We have support for non-random dictionaries now? Wonderful!
But yes, out of scope for this CL.

     DEFINE_INLINE_TRACE() { }
 
 private: