add missing include

Change-Id: I497b03052274347f1cf47c4b276ab1d2c61f6db2
diff --git a/samples/BrowserPlugin/jni/RenderingThread.cpp b/samples/BrowserPlugin/jni/RenderingThread.cpp
index 1307e90..5e27f28 100644
--- a/samples/BrowserPlugin/jni/RenderingThread.cpp
+++ b/samples/BrowserPlugin/jni/RenderingThread.cpp
@@ -26,6 +26,8 @@
 
 #include "ANPNativeWindow_npapi.h"
 
+#include <android/native_window.h>
+
 extern ANPLogInterfaceV0           gLogI;
 extern ANPNativeWindowInterfaceV0  gNativeWindowI;