[Remote suggestions] Prioritize wifi for soft fetches.

chrome/browser/android/ntp/ntp_snippets_launcher.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_NTP_NTP_SNIPPETS_LAUNCHER_H_
 #define CHROME_BROWSER_ANDROID_NTP_NTP_SNIPPETS_LAUNCHER_H_
 
 #include "base/android/jni_android.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "components/ntp_snippets/remote/persistent_scheduler.h"
 
 // Android implementation of ntp_snippets::NTPSnippetsScheduler.
 // The NTPSnippetsLauncher singleton owns the Java SnippetsLauncher object, and
 // is used to schedule the fetching of snippets. Runs on the UI thread.
 class NTPSnippetsLauncher : public ntp_snippets::PersistentScheduler {
  public:
   static NTPSnippetsLauncher* Get();
 
   // ntp_snippets::NTPSnippetsScheduler implementation.
   bool Schedule(base::TimeDelta period_wifi,
                 base::TimeDelta period_fallback) override;
   bool Unschedule() override;
+  bool IsOnUnmeteredConnection() override;
 
  private:
   friend struct base::LazyInstanceTraitsBase<NTPSnippetsLauncher>;
 
   // Constructor and destructor marked private to enforce singleton.
   NTPSnippetsLauncher();
   virtual ~NTPSnippetsLauncher();
 
   base::android::ScopedJavaGlobalRef<jobject> java_launcher_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPSnippetsLauncher);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_NTP_NTP_SNIPPETS_LAUNCHER_H_