Implement the file chooser as a new resource "host"

ppapi/proxy/plugin_resource.cc

Index: ppapi/proxy/plugin_resource.cc
diff --git a/ppapi/proxy/plugin_resource.cc b/ppapi/proxy/plugin_resource.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6e387bb5c68c2cb22fb2b16632b021b0b74805fd
--- /dev/null
+++ b/ppapi/proxy/plugin_resource.cc
@@ -0,0 +1,52 @@
+// 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/proxy/plugin_resource.h"
+
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/proxy/resource_message_params.h"
+
+namespace ppapi {
+namespace proxy {
+
+PluginResource::PluginResource(IPC::Sender* sender, PP_Instance instance)
+    : Resource(OBJECT_IS_PROXY, instance),
+      sender_(sender),
+      next_sequence_number_(0),
+      sent_create_to_renderer_(false) {
+}
+
+PluginResource::~PluginResource() {
+  if (sent_create_to_renderer_)
+    Send(new PpapiHostMsg_ResourceDestroyed(pp_resource()));
+}
+
+bool PluginResource::Send(IPC::Message* message) {
+  return sender_->Send(message);
+}
+
+void PluginResource::SendCreateToRenderer(const IPC::Message& msg) {
+  DCHECK(!sent_create_to_renderer_);
+  sent_create_to_renderer_ = true;
+  ResourceMessageCallParams params(pp_resource(),
+                                   next_sequence_number_++);
+  Send(new PpapiHostMsg_ResourceCreated(params, pp_instance(), msg));
+}
+
+void PluginResource::PostToRenderer(const IPC::Message& msg) {
+  ResourceMessageCallParams params(pp_resource(),
+                                   next_sequence_number_++);
+  Send(new PpapiHostMsg_ResourceCall(params, msg));
+}
+
+int32_t PluginResource::CallRenderer(const IPC::Message& msg) {
+  ResourceMessageCallParams params(pp_resource(),
+                                   next_sequence_number_++);
+  params.set_has_callback();
+  Send(new PpapiHostMsg_ResourceCall(params, msg));
+  return params.sequence();
+}
+
+}  // namespace proxy
+}  // namespace ppapi