Enable Chrome to tweak search engines for some locales

chrome/browser/android/locale/special_locale_handler.h

+// Copyright (c) 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_LOCALE_SPECIAL_LOCALE_HANDLER_H_
+#define CHROME_BROWSER_ANDROID_LOCALE_SPECIAL_LOCALE_HANDLER_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "components/search_engines/template_url.h"
+
+using base::android::JavaParamRef;
+using std::string;
+using std::vector;

[Maria, 2016/09/22 17:17:55]

nit: I feel like it's really uncommon to have using statements in header files,
not sure whether there's something in the style guide about this

[Peter Kasting, 2016/09/23 01:28:36]

I don't know that there's anything explicit, but yes, this is a bad move, don't
do it.

In this case, there's no reason for the using directives anyway, because they
cost lines of code rather than making things less noisy.  And "using std::XYZ"
is frowned-on in Chromium anyway, since the std:: qualifier is short and makes
it clear you're using something from the STL instead of e.g. a weird custom
string class (cough, google3, cough).

[Ian Wen, 2016/09/23 22:01:56]

Done.

+
+class TemplateURLService;
+
+class SpecialLocaleHandler {
+ public:
+  explicit SpecialLocaleHandler(const string& locale);
+  void Destroy(JNIEnv* env, const JavaParamRef<jobject>& obj);
+  jboolean LoadTemplateUrls(JNIEnv* env, const JavaParamRef<jobject>& obj);
+  void RemoveTemplateUrls(JNIEnv* env, const JavaParamRef<jobject>& obj);
+  void OverrideDefaultSearchProvider(JNIEnv* env,
+                                     const JavaParamRef<jobject>& obj);
+
+ private:
+  virtual ~SpecialLocaleHandler();
+
+  string locale_;
+
+  // Tracks all local search engines that were added to TURL service.
+  vector<int> prepopulate_ids_;
+
+  // Pointer to the TemplateUrlService for the main profile.
+  TemplateURLService* template_url_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(SpecialLocaleHandler);
+};
+
+bool RegisterSpecialLocaleHandler(JNIEnv* env);
+
+#endif  // CHROME_BROWSER_ANDROID_LOCALE_SPECIAL_LOCALE_HANDLER_H_