PPAPI/NaCl: Make NaClIPCAdapter transfer handles more generally

ppapi/shared_impl/host_resource.h

 // Copyright (c) 2011 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.
 
 #ifndef PPAPI_SHARED_IMPL_HOST_RESOURCE_H_
 #define PPAPI_SHARED_IMPL_HOST_RESOURCE_H_
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
 
 // Represents a PP_Resource sent over the wire. This just wraps a PP_Resource.
 // The point is to prevent mistakes where the wrong resource value is sent.
 // Resource values are remapped in the plugin so that it can talk to multiple
 // hosts. If all values were PP_Resource, it would be easy to forget to do
 // this tranformation.
 //
 // All HostResources respresent IDs valid in the host.
 class PPAPI_SHARED_EXPORT HostResource {
  public:
-  HostResource() : instance_(0), host_resource_(0) {
-  }
+  HostResource();
 
   bool is_null() const {
     return !host_resource_;
   }
 
   // Some resources are plugin-side only and don't have a corresponding
   // resource in the host. Yet these resources still need an instance to be
   // associated with. This function creates a HostResource with the given
   // instances and a 0 host resource ID for these cases.
-  static HostResource MakeInstanceOnly(PP_Instance instance) {
-    HostResource resource;
-    resource.SetHostResource(instance, 0);
-    return resource;
-  }
+  static HostResource MakeInstanceOnly(PP_Instance instance);
 
   // Sets and retrieves the internal PP_Resource which is valid for the host
   // (a.k.a. renderer, as opposed to the plugin) process.
   //
   // DO NOT CALL THESE FUNCTIONS IN THE PLUGIN SIDE OF THE PROXY. The values
   // will be invalid. See the class comment above.
-  void SetHostResource(PP_Instance instance, PP_Resource resource) {
-    instance_ = instance;
-    host_resource_ = resource;
-  }
+  void SetHostResource(PP_Instance instance, PP_Resource resource);
   PP_Resource host_resource() const {
     return host_resource_;
   }
 
   PP_Instance instance() const { return instance_; }
 
   // This object is used in maps so we need to provide this sorting operator.
   bool operator<(const HostResource& other) const {
     if (instance_ != other.instance_)
       return instance_ < other.instance_;
     return host_resource_ < other.host_resource_;
   }
 
  private:
   PP_Instance instance_;
   PP_Resource host_resource_;
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_HOST_RESOURCE_H_