Apps V2 in Pepper: introduce singleton resource ExtensionsCommon.

chrome/renderer/pepper/pepper_extensions_common_host.h

+// Copyright (c) 2013 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 CHROME_RENDERER_PEPPER_PEPPER_EXTENSIONS_COMMON_HOST_H_
+#define CHROME_RENDERER_PEPPER_PEPPER_EXTENSIONS_COMMON_HOST_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/linked_ptr.h"
+#include "ppapi/host/resource_host.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace content {
+class RendererPpapiHost;
+}
+
+namespace ppapi {
+namespace host {
+struct ReplyMessageContext;
+}
+}
+
+namespace chrome {
+
+class PepperExtensionsCommonHost : public ppapi::host::ResourceHost {
+ public:
+  virtual ~PepperExtensionsCommonHost();
+
+  static PepperExtensionsCommonHost* Create(content::RendererPpapiHost* host,
+                                            PP_Instance instance,
+                                            PP_Resource resource);
+
+  // ppapi::host::ResourceMessageHandler overrides.
+  virtual int32_t OnResourceMessageReceived(
+      const IPC::Message& msg,
+      ppapi::host::HostMessageContext* context) OVERRIDE;
+
+ private:
+  typedef std::map<int, linked_ptr<ppapi::host::ReplyMessageContext> >
+      PendingRequestMap;
+
+  PepperExtensionsCommonHost(content::RendererPpapiHost* host,
+                             PP_Instance instance,
+                             PP_Resource resource);
+
+  int32_t OnPost(ppapi::host::HostMessageContext* context,
+                 const std::string& request_name,
+                 const base::ListValue& args);
+
+  int32_t OnCall(ppapi::host::HostMessageContext* context,
+                 const std::string& request_name,
+                 const base::ListValue& args);
+
+  // Non-owning pointer.
+  content::RendererPpapiHost* renderer_ppapi_host_;
+
+  PendingRequestMap pending_request_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperExtensionsCommonHost);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_RENDERER_PEPPER_PEPPER_EXTENSIONS_COMMON_HOST_H_