Add helper to open URL in new activity

chrome/browser/android/ntp/notification_helper.cc

+// Copyright 2016 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 "chrome/browser/android/ntp/notification_helper.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "jni/NotificationHelper_jni.h"
+
+namespace ntp_snippets {
+
+void NotificationHelper::OpenURL(const GURL& url) {
+  JNIEnv* env = base::android::AttachCurrentThread();

[Bernhard Bauer, 2016/12/19 17:04:10]

You are also going to have to register the JNI methods.

[sfiera, 2016/12/19 17:09:40]

Here we only have @CalledFromNative (C++->Java), no native methods (Java->C++).
Is there anything to register?

[Bernhard Bauer, 2016/12/19 17:20:16]

I vaguely remember that the guidance was to call RegisterNativesImpl() anyway,
but I can't find anything about it now, and torne@ is OOO, so go ahead if you
want to.

[sfiera, 2016/12/19 18:21:24]

OK. I was working on the model of path_utils.cc, which doesn't.

+  Java_NotificationHelper_openUrl(
+      env, base::android::ConvertUTF8ToJavaString(env, url.spec()));
+}
+
+}  // namespace ntp_snippets