Android: fix test runners for non-rooted devices.

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

 // 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.
 
 package org.chromium.native_test;
 
 import android.app.Activity;
 import android.content.Context;
 import android.os.Bundle;
+import android.os.Environment;
 import android.os.Handler;
 import android.util.Log;
 
 import org.chromium.base.PathUtils;
 
+import java.io.File;
+
 // Android's NativeActivity is mostly useful for pure-native code.
 // Our tests need to go up to our own java classes, which is not possible using
 // the native activity class loader.
 public class ChromeNativeTestActivity extends Activity {
     private final String TAG = "ChromeNativeTestActivity";
     private final String EXTRA_RUN_IN_SUB_THREAD = "RunInSubThread";
     // We post a delayed task to run tests so that we do not block onCreate().
     private static long RUN_TESTS_DELAY_IN_MS = 300;
 
     // Name of our shlib as obtained from a string resource.
@@ skipping 35 matching lines @@
             }
         } catch (UnsatisfiedLinkError e) {
             Log.e(TAG, "Unable to load lib" + mLibrary + ".so: " + e);
             nativeTestFailed();
             throw e;
         }
     }
 
     private void runTests() {
         Log.d(TAG, ">>nativeRunTests");
-        nativeRunTests(getFilesDir().getAbsolutePath(), getApplicationContext());
+        // This directory is used by build/android/pylib/test_package_apk.py.
+        File filesDir = new File(Environment.getExternalStorageDirectory(),
+                                 "native_tests/");
+        filesDir.mkdirs();
+        nativeRunTests(filesDir.getAbsolutePath(), getApplicationContext());
         Log.d(TAG, "<<nativeRunTests");
     }
 
     // Signal a failure of the native test loader to python scripts
     // which run tests.  For example, we look for
     // RUNNER_FAILED build/android/test_package.py.
     private void nativeTestFailed() {
         Log.e(TAG, "[ RUNNER_FAILED ] could not load native library");
     }
 
     private void loadLibrary() throws UnsatisfiedLinkError {
         Log.i(TAG, "loading: " + mLibrary);
         System.loadLibrary(mLibrary);
         Log.i(TAG, "loaded: " + mLibrary);
     }
 
     private native void nativeRunTests(String filesDir, Context appContext);
 }