Add Cronet Test App that uses libcronet_tests.so with net test utilities.

components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/CronetTestBase.java

Index: components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/CronetTestBase.java
diff --git a/components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/CronetTestBase.java b/components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/CronetTestBase.java
new file mode 100644
index 0000000000000000000000000000000000000000..1c2e52cdaa65539a39c10ed14a4c021f0bab6071
--- /dev/null
+++ b/components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/CronetTestBase.java
@@ -0,0 +1,62 @@
+// Copyright 2014 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.cronet_test_apk;
+
+import android.content.ComponentName;
+import android.content.Intent;
+import android.net.Uri;
+import android.test.ActivityInstrumentationTestCase2;
+
+/**
+ * Base test class for all CronetTest based tests.
+ */
+public class CronetTestBase extends
+        ActivityInstrumentationTestCase2<CronetTestActivity> {

[mmenke, 2014/09/11 18:05:24]

Now that we have this, do we still need CronetSampleTestBase?  Or anything else
in that directory, for that matter?

[mef, 2014/09/11 18:37:54]

I'm going to prune that in separate CL. 
I would like to make Sample a simple sample :) AND use that for Proguard
application.

+    public CronetTestBase() {
+        super(CronetTestActivity.class);
+    }
+
+    /**
+     * Starts the CronetTest activity.
+     */
+    protected CronetTestActivity launchCronetTestApp() {
+        return launchCronetTestAppWithUrlAndCommandLineArgs(null, null);
+    }
+
+

[mmenke, 2014/09/11 18:05:24]

nit:  Remove extra blank line.

[mef, 2014/09/11 18:37:54]

Done.

+    /**
+     * Starts the CronetTest activity and loads the given URL. The URL can be
+     * null.
+     */
+    protected CronetTestActivity launchCronetTestAppWithUrl(String url) {
+        return launchCronetTestAppWithUrlAndCommandLineArgs(url, null);
+    }
+
+    /**
+     * Starts the CronetTest activity appending the provided command line
+     * arguments and loads the given URL. The URL can be null.
+     */
+    protected CronetTestActivity launchCronetTestAppWithUrlAndCommandLineArgs(
+            String url, String[] commandLineArgs) {
+        Intent intent = new Intent(Intent.ACTION_MAIN);
+        intent.addCategory(Intent.CATEGORY_LAUNCHER);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        if (url != null)
+            intent.setData(Uri.parse(url));
+        intent.setComponent(new ComponentName(
+                getInstrumentation().getTargetContext(),
+                CronetTestActivity.class));
+        if (commandLineArgs != null) {
+            intent.putExtra(CronetTestActivity.COMMAND_LINE_ARGS_KEY,
+                    commandLineArgs);
+        }
+        setActivityIntent(intent);
+        return getActivity();
+    }
+
+    protected boolean waitForActiveShellToBeDoneLoading() {
+        return true;

[mmenke, 2014/09/11 18:05:25]

Why is this different from the old version?  Is this needed at all?

[mef, 2014/09/11 18:37:54]

It *appears* to work fine without it, so I think we should remove it.
I think old version has inherited it from some other test that I've used for
inspiration. :)

[mmenke, 2014/09/11 18:54:41]

I don't see how testLoadUrl or testPostData aren't racy without that - they need
to wait a URL to load, and don't seem to have any other logic to actually do
that.

[mef, 2014/09/11 19:47:50]

Done. Excellent point.

+    }
+}