[Android] Introduce a Java wrapper for TemplateUrlService.

base/android/jni_map.h

+// Copyright (c) 2013 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 BASE_ANDROID_JNI_MAP_H_
+#define BASE_ANDROID_JNI_MAP_H_
+
+#include <jni.h>
+#include <map>
+#include <string>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/base_export.h"
+#include "base/string16.h"
+
+namespace base {
+namespace android {
+
+// Convert a std::map<std::string, string16> to a Java HashMap<String, String>
+BASE_EXPORT ScopedJavaLocalRef<jobject> ConvertMapToJavaMap(
+    JNIEnv* env,
+    const std::map<std::string, string16>& cmap);
+
+// Convert a Java subclass of map to std::map. Assumes values are string16.
+// Any null key/values are dropped.
+BASE_EXPORT std::map<std::string, string16> ConvertJavaMapToMap(JNIEnv* env,
+                                                                jobject jmap);
+
+bool RegisterMap(JNIEnv* env);
+
+}  // namespace android
+}  // namespace base
+
+#endif  // BASE_ANDROID_JNI_MAP_H_