[PPAPI] Implement an IOStreamResource for data transmission between plugin and renderer.

ppapi/host/ppapi_host.cc

 // 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.
 
 #include "ppapi/host/ppapi_host.h"
 
 #include "base/logging.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/host/host_factory.h"
 #include "ppapi/host/host_message_context.h"
 #include "ppapi/host/instance_message_filter.h"
 #include "ppapi/host/resource_host.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/resource_message_params.h"
+#include "ppapi/proxy/serialized_handle.h"
 #include "ppapi/shared_impl/host_resource.h"
 
 namespace ppapi {
 namespace host {
 
+using ppapi::proxy::SerializedHandle;

[yzshen1, 2014/01/03 21:51:41]

nit: no need to have ppapi::

+
 namespace {
 
 // Put a cap on the maximum number of resources so we don't explode if the
 // renderer starts spamming us.
 const size_t kMaxResourcesPerPlugin = 1 << 14;
 
 }  // namespace
 
 PpapiHost::PpapiHost(IPC::Sender* sender,
                      const PpapiPermissions& perms)
@@ skipping 62 matching lines @@
                                                    context.params,
                                                    msg));
     } else {
       Send(new PpapiPluginMsg_ResourceReply(context.params, msg));
     }
   }
 }
 
 void PpapiHost::SendUnsolicitedReply(PP_Resource resource,
                                      const IPC::Message& msg) {
-  TRACE_EVENT2("ppapi proxy", "PpapiHost::SendUnsolicitedReply",
+  SendUnsolicitedReplyWithHandle(resource, msg, SerializedHandle());
+}
+
+void PpapiHost::SendUnsolicitedReplyWithHandle(PP_Resource resource,
+                                               const IPC::Message& msg,
+                                               const SerializedHandle& handle) {

[dmichael (off chromium), 2014/01/03 18:05:29]

Maybe this accept a vector of handles? Then SendUnsolicitedReply can pass an
empty vector, and you don't need the IsHandleValid check, and it will be able to
support multiple handles if that's ever necessary.

+  TRACE_EVENT2("ppapi proxy", "PpapiHost::SendUnsolicitedReplyWithHandle",
                "Class", IPC_MESSAGE_ID_CLASS(msg.type()),
                "Line", IPC_MESSAGE_ID_LINE(msg.type()));
   DCHECK(resource);  // If this fails, host is probably pending.
   proxy::ResourceMessageReplyParams params(resource, 0);
+  if (handle.IsHandleValid())
+    params.AppendHandle(handle);
   Send(new PpapiPluginMsg_ResourceReply(params, msg));
 }
 
 scoped_ptr<ResourceHost> PpapiHost::CreateResourceHost(
     const proxy::ResourceMessageCallParams& params,
     PP_Instance instance,
     const IPC::Message& nested_msg) {
   scoped_ptr<ResourceHost> resource_host;
   DCHECK(!host_factory_filters_.empty());  // Caller forgot to add a factory.
   for (size_t i = 0; i < host_factory_filters_.size(); i++) {
@@ skipping 144 matching lines @@
   resources_.erase(found);
 }
 
 ResourceHost* PpapiHost::GetResourceHost(PP_Resource resource) const {
   ResourceMap::const_iterator found = resources_.find(resource);
   return found == resources_.end() ? NULL : found->second.get();
 }
 
 }  // namespace host
 }  // namespace ppapi