Enable NativeActivity based Android tests.

testing/android/native_test/java/src/org/chromium/native_test/NativeUnitTestNativeActivity.java

Index: testing/android/native_test/java/src/org/chromium/native_test/NativeUnitTestNativeActivity.java
diff --git a/testing/android/native_test/java/src/org/chromium/native_test/NativeUnitTestNativeActivity.java b/testing/android/native_test/java/src/org/chromium/native_test/NativeUnitTestNativeActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..d0dfd485ba14c88bc8dd879f97872d674329220b
--- /dev/null
+++ b/testing/android/native_test/java/src/org/chromium/native_test/NativeUnitTestNativeActivity.java
@@ -0,0 +1,32 @@
+// Copyright 2015 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.
+
+package org.chromium.native_test;
+
+import android.app.NativeActivity;
+import android.os.Bundle;
+
+/**
+ * A {@link android.app.NativeActivity} for running native unit tests.
+ * (i.e., not browser tests)
+ */
+public class NativeUnitTestNativeActivity extends NativeActivity {
+    private NativeUnitTest mTest = new NativeUnitTest();
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        mTest.preCreate(this);
+        super.onCreate(savedInstanceState);
+        mTest.postCreate(this);
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        // Force running in sub thread,
+        // since NativeActivity processes Looper messages in native code,
+        // which makes invoking the test runner Handler problematic.
+        mTest.postStart(this, true);
+    }
+}