Upstream oodles of Chrome for Android code into Chromium.

chrome/browser/android/contextualsearch/contextual_search_tab_helper.cc

+// 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.
+
+#include "chrome/browser/android/contextualsearch/contextual_search_tab_helper.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/prefs/pref_change_registrar.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_android.h"
+#include "chrome/common/pref_names.h"
+#include "jni/ContextualSearchTabHelper_jni.h"
+
+
+ContextualSearchTabHelper::ContextualSearchTabHelper(JNIEnv* env,
+                                                     jobject obj,
+                                                     Profile* profile)
+    : weak_java_ref_(env, obj),
+      pref_change_registrar_(new PrefChangeRegistrar()),
+      weak_factory_(this) {
+  pref_change_registrar_->Init(profile->GetPrefs());
+  pref_change_registrar_->Add(
+      prefs::kContextualSearchEnabled,
+      base::Bind(&ContextualSearchTabHelper::OnContextualSearchPrefChanged,
+                 weak_factory_.GetWeakPtr()));
+}
+
+ContextualSearchTabHelper::~ContextualSearchTabHelper() {
+  pref_change_registrar_->RemoveAll();
+}
+
+void ContextualSearchTabHelper::OnContextualSearchPrefChanged() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> jobj = weak_java_ref_.get(env);
+  Java_ContextualSearchTabHelper_onContextualSearchPrefChanged(env, jobj.obj());
+}
+
+void ContextualSearchTabHelper::Destroy(JNIEnv* env, jobject obj) {
+  delete this;
+}
+
+static jlong Init(JNIEnv* env, jobject obj, jobject java_profile) {
+  Profile* profile = ProfileAndroid::FromProfileAndroid(java_profile);
+  CHECK(profile);
+  ContextualSearchTabHelper* tab = new ContextualSearchTabHelper(
+      env, obj, profile);
+  return reinterpret_cast<intptr_t>(tab);
+}
+
+bool RegisterContextualSearchTabHelper(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}