Auto merge of #6219 - zmike:favicons_and_stringlOWWW-MY-HEAD, r=pcwalton

Getting these down to the embedding API level required that I redo the bindings generator again, so this is more commits than anticipated.

@mbrubeck @Manishearth @pcwalton but NOT @larsbergstrom so don't even look at this.

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components/compositing/compositor.rs

@@ -454,6 +454,14 @@ impl<Window: WindowMethods> IOCompositor<Window> {
                 self.composite_if_necessary(CompositingReason::Headless);
             }
 
+            (Msg::NewFavicon(url), ShutdownState::NotShuttingDown) => {
+                self.window.set_favicon(url);
+            }
+
+            (Msg::HeadParsed, ShutdownState::NotShuttingDown) => {
+                self.window.head_parsed();
+            }
+
             // When we are shutting_down, we need to avoid performing operations
             // such as Paint that may crash because we have begun tearing down
             // the rest of our resources.