Upstream oodles of Chrome for Android code into Chromium.

chrome/browser/android/contextualsearch/contextual_search_tab_helper.h

+// Copyright 2015 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_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_TAB_HELPER_H_
+#define CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_TAB_HELPER_H_
+
+#include <jni.h>
+
+#include "base/android/jni_weak_ref.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/prefs/pref_change_registrar.h"
+
+class Profile;
+
+class ContextualSearchTabHelper {
+ public:
+  ContextualSearchTabHelper(JNIEnv* env, jobject obj, Profile* profile);
+  void Destroy(JNIEnv* env, jobject obj);
+
+ private:
+  ~ContextualSearchTabHelper();
+  void OnContextualSearchPrefChanged();
+
+  JavaObjectWeakGlobalRef weak_java_ref_;
+  scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
+  base::WeakPtrFactory<ContextualSearchTabHelper> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(ContextualSearchTabHelper);
+};
+
+bool RegisterContextualSearchTabHelper(JNIEnv* env);
+
+#endif  // CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_TAB_HELPER_H_