Add missing NaCl PPAPI test components to Chrome repo.

ppapi/native_client/tests/earth/earth.h

+/*
+ * Copyright (c) 2011 The Native Client 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 NATIVE_CLIENT_TESTS_EARTH_EARTH_H_
+#define NATIVE_CLIENT_TESTS_EARTH_EARTH_H_
+
+#include <stdint.h>
+#include <string.h>
+
+/* NaCl Earth demo */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void DebugPrintf(const char *fmt, ...);
+void Earth_Init(int argcount, const char *argname[], const char *argvalue[]);
+void Earth_Draw(uint32_t* image_data, int width, int height);
+void Earth_Sync();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* NATIVE_CLIENT_TESTS_EARTH_EARTH_H_ */