Implement the file chooser as a new resource "host"

content/renderer/pepper/pepper_instance_state_accessor_impl.h

+// 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.
+
+#ifndef CONTENT_RENDERER_PEPPER_PEPPER_INSTANCE_STATE_ACCESSOR_IMPL_H
+#define CONTENT_RENDERER_PEPPER_PEPPER_INSTANCE_STATE_ACCESSOR_IMPL_H
+
+#include "base/compiler_specific.h"
+#include "content/renderer/pepper/pepper_instance_state_accessor.h"
+
+namespace webkit {
+namespace ppapi {
+class PluginInstance;
+class PluginModule;
+}
+}
+
+namespace content {
+
+class PepperInstanceStateAccessorImpl : public PepperInstanceStateAccessor {
+ public:
+  PepperInstanceStateAccessorImpl(webkit::ppapi::PluginModule* module);
+  virtual ~PepperInstanceStateAccessorImpl();
+
+  // PepperInstanceStateAccessor implmentation.
+  virtual bool IsValidInstance(PP_Instance instance) OVERRIDE;
+  virtual bool HasUserGesture(PP_Instance pp_instance) OVERRIDE;
+
+ private:
+  // Retrieves the plugin instance object associated with the given PP_Instance
+  // and validates that it is one of the instances associated with our module.
+  // Returns NULL on failure.
+  //
+  // We use this to security check the PP_Instance values sent from a plugin to
+  // make sure it's not trying to spoof another instance.
+  webkit::ppapi::PluginInstance* GetAndValidateInstance(PP_Instance instance);
+
+  webkit::ppapi::PluginModule* module_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperInstanceStateAccessorImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_PEPPER_PEPPER_INSTANCE_STATE_ACCESSOR_IMPL_H