Add an initial implementation of net-internals inspector in javascript....

net/base/net_log.h

Index: net/base/net_log.h
===================================================================
--- net/base/net_log.h	(revision 42238)
+++ net/base/net_log.h	(working copy)
@@ -118,6 +118,9 @@
   // Returns a C-String symbolic name for |event_type|.
   static const char* EventTypeToString(EventType event_type);
 
+  // Returns a list of all the available EventTypes.
+  static std::vector<EventType> GetAllEventTypes();
+
  private:
   DISALLOW_COPY_AND_ASSIGN(NetLog);
 };