Add resource message call and reply infrastructure.

ppapi/proxy/ppapi_messages.h

Index: ppapi/proxy/ppapi_messages.h
diff --git a/ppapi/proxy/ppapi_messages.h b/ppapi/proxy/ppapi_messages.h
index cd54ae96c3f12e95a911dd7ecc6c7082b59db0cc..d569b825e4d1e6e362e7106277c36b133cb88008 100644
--- a/ppapi/proxy/ppapi_messages.h
+++ b/ppapi/proxy/ppapi_messages.h
@@ -37,6 +37,7 @@
 #include "ppapi/c/private/ppp_flash_browser_operations.h"
 #include "ppapi/proxy/ppapi_param_traits.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/proxy/resource_message_params.h"
 #include "ppapi/proxy/serialized_flash_menu.h"
 #include "ppapi/proxy/serialized_structs.h"
 #include "ppapi/shared_impl/ppapi_preferences.h"
@@ -1384,4 +1385,34 @@ IPC_SYNC_MESSAGE_CONTROL1_2(PpapiHostMsg_PPBX509Certificate_ParseDER,
 // PPB_Font.
 IPC_SYNC_MESSAGE_CONTROL0_1(PpapiHostMsg_PPBFont_GetFontFamilies,
                             std::string /* result */)
+
 #endif  // !defined(OS_NACL)
+
+//-----------------------------------------------------------------------------
+// New-style resource call/reply messages.

[bbudge, 2012/06/18 17:23:47]

A more informative comment about the idea of resource call/reply messages and
nested messages would be helpful here.

+
+// Notification that the a resource has been created in the plugin. The nested

[bbudge, 2012/06/18 17:23:47]

s/the a/a/

+// message will be resource-type-specific.
+IPC_MESSAGE_CONTROL3(PpapiHostMsg_ResourceCreated,
+                     ppapi::proxy::ResourceMessageCallParams /* call_params */,
+                     PP_Instance  /* instance */,
+                     IPC::Message /* nested_msg */)
+
+// Notificaition that a resource has been destroyed in the plugin.

[bbudge, 2012/06/18 17:23:47]

sp. Notification

+IPC_MESSAGE_CONTROL1(PpapiHostMsg_ResourceDestroyed,
+                     PP_Resource /* resource */)
+
+// A resource call is a request from the plugin to the host. It may or may not
+// require a reply, depending on the params. The nested message will be
+// resource-type-specific.
+IPC_MESSAGE_CONTROL2(PpapiHostMsg_ResourceCall,
+                     ppapi::proxy::ResourceMessageCallParams /* call_params */,
+                     IPC::Message /* nested_msg */)
+
+// A resource reply is a response from a ResourceCall from a host to the

[bbudge, 2012/06/18 17:23:47]

s/response from/response to

+// plugin. The resource ID + sequence number in the params will correspond to
+// that of a previous ResourceCall.

[bbudge, 2012/06/18 17:23:47]

A "previous" ResourceCall or the one that this is replying to?

+IPC_MESSAGE_CONTROL2(
+    PpapiPluginMsg_ResourceReply,
+    ppapi::proxy::ResourceMessageReplyParams /* reply_params */,
+    IPC::Message /* nested_msg */)