WIP: A couple of more ChannelMojo speedup ideas

third_party/mojo/src/mojo/edk/system/channel_endpoint_client.h

Index: third_party/mojo/src/mojo/edk/system/channel_endpoint_client.h
diff --git a/third_party/mojo/src/mojo/edk/system/channel_endpoint_client.h b/third_party/mojo/src/mojo/edk/system/channel_endpoint_client.h
index c758e9c5485e4533d158b930548fc42e19084475..3e722b6a8d9ccea93f4b3a6e51a753d955d9b3f0 100644
--- a/third_party/mojo/src/mojo/edk/system/channel_endpoint_client.h
+++ b/third_party/mojo/src/mojo/edk/system/channel_endpoint_client.h
@@ -8,13 +8,12 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "mojo/edk/system/message_in_transit.h"
 #include "mojo/edk/system/system_impl_export.h"
 
 namespace mojo {
 namespace system {
 
-class MessageInTransit;
-
 // Interface for receivers of messages from |ChannelEndpoint| (hence from
 // |Channel|). |port| is simply the value passed to |ChannelEndpoint| on
 // construction, and provides a lightweight way for an object to be the client
@@ -40,7 +39,8 @@ class MOJO_SYSTEM_IMPL_EXPORT ChannelEndpointClient
   // |client_port|.)
   //
   // This should return true if it accepted (and took ownership of) |message|.
-  virtual bool OnReadMessage(unsigned port, MessageInTransit* message) = 0;
+  virtual bool OnReadMessage(unsigned port,
+                             MessageInTransit::ReadContext& message) = 0;
 
   // Called by |ChannelEndpoint| when the |Channel| is relinquishing its pointer
   // to the |ChannelEndpoint| (and vice versa). After this is called,