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

components/cronet/android/test/cronet_tests_jni.cc

+// 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.
+
+#include <jni.h>
+
+#include "base/android/base_jni_registrar.h"
+#include "base/android/jni_android.h"
+#include "base/android/jni_registrar.h"
+#include "components/cronet/android/cronet_loader.h"
+
+namespace {
+
+const base::android::RegistrationMethod kCronetTestsRegisteredMethods[] = {
+    {"BaseAndroid", base::android::RegisterJni},

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

nit: 2 space indent.

+};
+
+}  // namespace
+
+// This is called by the VM when the shared library is first loaded.
+// Checks the available version of JNI. Also, caches Java reflection artifacts.
+extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+  JNIEnv* env;
+  if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {

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

This is already in CronetOnLoad.  Should we duplicate it?

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

This is needed to get env for the call to RegisterNativeMethods down below.
I suppose I could return env from CronetOnLoad, either way is fine with me.

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

Ah, right...This is fine.  I hadn't realized we were using the env (I've been
thinking of base::android::AttachCurrentThread as the archetypical way to get
it).

+    return -1;
+  }
+
+  jint cronet_onload = cronet::CronetOnLoad(vm, reserved);
+  if (cronet_onload == -1)
+    return cronet_onload;
+
+  if (!base::android::RegisterNativeMethods(
+          env,
+          kCronetTestsRegisteredMethods,
+          arraysize(kCronetTestsRegisteredMethods))) {
+    return -1;
+  }
+  return cronet_onload;
+}
+
+extern "C" void JNIEXPORT JNICALL JNI_OnUnLoad(JavaVM* vm, void* reserved) {
+  cronet::CronetOnUnLoad(vm, reserved);
+}
+