Create a PPAPI host for new resource message routing.

ppapi/host/ppapi_host_export.h

Index: ppapi/host/ppapi_host_export.h
diff --git a/ppapi/host/ppapi_host_export.h b/ppapi/host/ppapi_host_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..90cf2ef928e7851193e70e279c14549bbf0cd56c
--- /dev/null
+++ b/ppapi/host/ppapi_host_export.h
@@ -0,0 +1,30 @@
+// 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 PPAPI_HOST_PPAPI_HOST_EXPORT_H_
+#define PPAPI_HOST_PPAPI_HOST_EXPORT_H_
+#pragma once
+
+#if defined(COMPONENT_BUILD)
+#if defined(WIN32)
+
+#if defined(PPAPI_HOST_IMPLEMENTATION)
+#define PPAPI_HOST_EXPORT __declspec(dllexport)
+#else
+#define PPAPI_HOST_EXPORT __declspec(dllimport)
+#endif  // defined(PPAPI_HOST_IMPLEMENTATION)
+
+#else  // defined(WIN32)
+#if defined(PPAPI_HOST_IMPLEMENTATION)
+#define PPAPI_HOST_EXPORT __attribute__((visibility("default")))
+#else
+#define PPAPI_HOST_EXPORT
+#endif
+#endif
+
+#else  // defined(COMPONENT_BUILD)
+#define PPAPI_HOST_EXPORT
+#endif
+
+#endif  // PPAPI_HOST_PPAPI_HOST_EXPORT_H_