Implement browser side of PPB_Printing resource.

ppapi/host/dispatch_host_message.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file provides infrastructure for dispatching host resource call
 // messages. Normal IPC message handlers can't take extra parameters or
 // return values. We want to take a HostMessageContext as a parameter and
 // also return the int32_t return value to the caller.
 
 #ifndef PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_
@@ skipping 45 matching lines @@
 
 template<class ObjT, class Method, class A, class B, class C, class D, class E>
 inline int32_t DispatchResourceCall(ObjT* obj, Method method,
                                     HostMessageContext* context,
                                     const Tuple5<A, B, C, D, E>& arg) {
   return (obj->*method)(context, arg.a, arg.b, arg.c, arg.d, arg.e);
 }
 
 // Note that this only works for message with 1 or more parameters. For
 // 0-parameter messages you need to use the _0 version below (since there are
-// no Params in the message).
+// no params in the message).
 #define PPAPI_DISPATCH_HOST_RESOURCE_CALL(msg_class, member_func) \
     case msg_class::ID: { \
       TRACK_RUN_IN_IPC_HANDLER(member_func); \
       msg_class::Schema::Param p; \
       if (msg_class::Read(&ipc_message__, &p)) { \
         return ppapi::host::DispatchResourceCall( \
             this, \
             &_IpcMessageHandlerClass::member_func, \
             context, p); \
       } \
       return PP_ERROR_FAILED; \
     }
 
 #define PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(msg_class, member_func) \
   case msg_class::ID: { \
     TRACK_RUN_IN_IPC_HANDLER(member_func); \
     return member_func(context); \
   }
 
 }  // namespace host
 }  // namespace ppapi
 
 #endif  // PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_