[WIP] Provided file system from NACL.

content/browser/renderer_host/pepper/pepper_filesystem_provider_host.h

Index: content/browser/renderer_host/pepper/pepper_filesystem_provider_host.h
diff --git a/content/browser/renderer_host/pepper/pepper_filesystem_provider_host.h b/content/browser/renderer_host/pepper/pepper_filesystem_provider_host.h
new file mode 100644
index 0000000000000000000000000000000000000000..42ac093f02c38de67e9fe5852cdc2e28c9012a93
--- /dev/null
+++ b/content/browser/renderer_host/pepper/pepper_filesystem_provider_host.h
@@ -0,0 +1,65 @@
+// Copyright 2015 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 PEPPERFILESYSTEMPROVIDERHOST_H
+#define PEPPERFILESYSTEMPROVIDERHOST_H
+
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/host/resource_host.h"
+
+namespace content {
+
+class PepperFilesystemProviderBackend {
+public:
+  virtual ~PepperFilesystemProviderBackend();
+  // Messages that interface with the provided filesystem backend
+  virtual int32_t SendMountRequest(
+      ppapi::host::HostMessageContext *context,
+      const base::ListValue&)=0;
+  virtual int32_t SendUnmountRequest(
+      ppapi::host::HostMessageContext* context,
+      const std::string& )=0;
+  virtual int32_t OnPluginResponse(
+      ppapi::host::HostMessageContext* context,
+      const base::ListValue&)=0;
+  virtual int32_t OnPluginWriteAck(
+      ppapi::host::HostMessageContext* context)=0;
+  virtual int32_t OnPluginNotification(
+      ppapi::host::HostMessageContext* context,
+      const base::ListValue&)=0;
+};
+
+
+class BrowserPpapiHost;
+
+class PepperFilesystemProviderHost :
+    public ppapi::host::ResourceHost
+{
+public:
+  PepperFilesystemProviderHost( BrowserPpapiHost *host,
+                                PP_Instance instance,
+                                PP_Resource resource);
+  ~PepperFilesystemProviderHost()override;
+private:
+  scoped_ptr<PepperFilesystemProviderBackend> backend_;
+
+  // ResourceMessageHandler interface
+protected:
+  int32_t OnResourceMessageReceived(
+      const IPC::Message& msg, ppapi::host::HostMessageContext*context)override;
+  // Messages that interface with the provided filesystem backend
+  int32_t OnHostMsgMount(ppapi::host::HostMessageContext *context,
+                           const base::ListValue&);
+  int32_t OnHostMsgUnmount(ppapi::host::HostMessageContext* context,
+                           const std::string& );
+  int32_t OnHostMsgPluginResponse( ppapi::host::HostMessageContext* context,
+                                   const base::ListValue& );
+  int32_t OnHostMsgPluginWriteAck(ppapi::host::HostMessageContext* context);
+  int32_t OnHostMsgPluginNotification(
+      ppapi::host::HostMessageContext* context,
+      const base::ListValue&);
+};
+} // namespace content
+
+#endif // PEPPERFILESYSTEMPROVIDERHOST_H