Adding monitoring to a number of DOM generation scripts.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 82f306dd2f9ab7e27a1eeec616dbfb3ac16676d7..ec56d3486bf11b69fe4aa55a1be22dbc5db900fe 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -10916,6 +10916,8 @@ class FileReaderSync native "*FileReaderSync" {
 
 @DocsEditable
 @DomName('DOMFileSystem')
+@SupportedBrowser(SupportedBrowser.CHROME)
+@Experimental
 class FileSystem native "*DOMFileSystem" {
 
   /// Checks if this type is supported on the current platform.
@@ -10944,6 +10946,8 @@ typedef void FileSystemCallback(FileSystem fileSystem);
 
 @DocsEditable
 @DomName('DOMFileSystemSync')
+@SupportedBrowser(SupportedBrowser.CHROME)
+@Experimental
 class FileSystemSync native "*DOMFileSystemSync" {
 
   @DomName('DOMFileSystemSync.name')
@@ -15861,10 +15865,18 @@ class MediaSource extends EventTarget native "*MediaSource" {
 @Experimental
 class MediaStream extends EventTarget native "*MediaStream" {
 
+  @DomName('MediaStream.addtrackEvent')
+  @DocsEditable
+  static const EventStreamProvider<Event> addTrackEvent = const EventStreamProvider<Event>('addtrack');
+
   @DomName('MediaStream.endedEvent')
   @DocsEditable
   static const EventStreamProvider<Event> endedEvent = const EventStreamProvider<Event>('ended');
 
+  @DomName('MediaStream.removetrackEvent')
+  @DocsEditable
+  static const EventStreamProvider<Event> removeTrackEvent = const EventStreamProvider<Event>('removetrack');
+
   @DomName('MediaStream.MediaStream')
   @DocsEditable
   factory MediaStream([stream_OR_tracks]) {
@@ -15929,10 +15941,18 @@ class MediaStream extends EventTarget native "*MediaStream" {
   @DocsEditable
   void removeTrack(MediaStreamTrack track) native;
 
+  @DomName('MediaStream.onaddtrack')
+  @DocsEditable
+  Stream<Event> get onAddTrack => addTrackEvent.forTarget(this);
+
   @DomName('MediaStream.onended')
   @DocsEditable
   Stream<Event> get onEnded => endedEvent.forTarget(this);
 
+  @DomName('MediaStream.onremovetrack')
+  @DocsEditable
+  Stream<Event> get onRemoveTrack => removeTrackEvent.forTarget(this);
+
 
   /**
    * Checks if the MediaStream APIs are supported on the current platform.
@@ -18920,6 +18940,10 @@ class RtcPeerConnection extends EventTarget native "*RTCPeerConnection" {
   @DocsEditable
   static const EventStreamProvider<RtcDataChannelEvent> dataChannelEvent = const EventStreamProvider<RtcDataChannelEvent>('datachannel');
 
+  @DomName('RTCPeerConnection.gatheringchangeEvent')
+  @DocsEditable
+  static const EventStreamProvider<Event> gatheringChangeEvent = const EventStreamProvider<Event>('gatheringchange');
+
   @DomName('RTCPeerConnection.icecandidateEvent')
   @DocsEditable
   static const EventStreamProvider<RtcIceCandidateEvent> iceCandidateEvent = const EventStreamProvider<RtcIceCandidateEvent>('icecandidate');
@@ -19130,6 +19154,10 @@ class RtcPeerConnection extends EventTarget native "*RTCPeerConnection" {
   @DocsEditable
   Stream<RtcDataChannelEvent> get onDataChannel => dataChannelEvent.forTarget(this);
 
+  @DomName('RTCPeerConnection.ongatheringchange')
+  @DocsEditable
+  Stream<Event> get onGatheringChange => gatheringChangeEvent.forTarget(this);
+
   @DomName('RTCPeerConnection.onicecandidate')
   @DocsEditable
   Stream<RtcIceCandidateEvent> get onIceCandidate => iceCandidateEvent.forTarget(this);
@@ -26308,11 +26336,17 @@ class Window extends EventTarget implements WindowBase native "@*DOMWindow" {
   @JSName('webkitConvertPointFromNodeToPage')
   @DomName('DOMWindow.webkitConvertPointFromNodeToPage')
   @DocsEditable
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @SupportedBrowser(SupportedBrowser.SAFARI)
+  @Experimental
   DomPoint convertPointFromNodeToPage(Node node, DomPoint p) native;
 
   @JSName('webkitConvertPointFromPageToNode')
   @DomName('DOMWindow.webkitConvertPointFromPageToNode')
   @DocsEditable
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @SupportedBrowser(SupportedBrowser.SAFARI)
+  @Experimental
   DomPoint convertPointFromPageToNode(Node node, DomPoint p) native;
 
   @JSName('webkitRequestFileSystem')