apk-based test runner work for android

base/android/jni_android.h

Index: base/android/jni_android.h
diff --git a/base/android/jni_android.h b/base/android/jni_android.h
index e483281dffb77e44afb327c35c82e19a33e0f60b..878798e41a1dd3cfa753bf8646df4c6608380294 100644
--- a/base/android/jni_android.h
+++ b/base/android/jni_android.h
@@ -14,6 +14,9 @@
 namespace base {
 namespace android {
 
+// Used to mark symbols to be exported in a shared library's symbol table.
+#define JNI_EXPORT __attribute__ ((visibility("default")))
+
 // Attach the current thread to the VM (if necessary) and return the JNIEnv*.
 JNIEnv* AttachCurrentThread();