Add an emit events algorithm

Author: jgraham

index.bs

@@ -519,6 +519,19 @@ To <dfn>obtain a set of event names</dfn> given an |name|:
 
 </div>
 
+<div algorithm>
+To <dfn>emit events</dfn> given |body| and |related browsing contexts|:
+
+1. [=Assert=]: |body| has [=map/size=] 2 and [=contains=] "<code>method</code>"
+   and "<code>params</code>".
+
+1. For each |session| in the [=set of sessions for which an event is enabled=]
+   given |body|["method"] and |related browsing contexts|:
+
+  1. [=Emit an event=] with |session| and |body|.
+
+</div>
+
 # Transport # {#transport}
 
 Message transport is provided using the WebSocket protocol.