Expose the Site Engagement Service to Java.

chrome/browser/engagement/site_engagement_service_android.h

Index: chrome/browser/engagement/site_engagement_service_android.h
diff --git a/chrome/browser/engagement/site_engagement_service_android.h b/chrome/browser/engagement/site_engagement_service_android.h
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+// 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_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_ANDROID_H_
+#define CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_ANDROID_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "chrome/browser/engagement/site_engagement_service.h"
+
+// Wrapper class to expose the Site Engagement Service to Java. This object is
+// owned by the |service_| which it wraps, and is lazily created when
+// a Java-side SiteEngagementService is constructed. Once created, all future
+// Java-side requests for a SiteEngagementService will use the same native
+// object.
+//
+// This class may only be used on the UI thread.
+class SiteEngagementServiceAndroid {
+ public:
+  static bool Register(JNIEnv* env);
+
+  // Returns the Java-side SiteEngagementService object corresponding to
+  // |service|.
+  static const base::android::ScopedJavaGlobalRef<jobject>& GetOrCreate(
+      JNIEnv* env,
+      SiteEngagementService* service);
+
+  SiteEngagementServiceAndroid(JNIEnv* env, SiteEngagementService* service);
+
+  ~SiteEngagementServiceAndroid();
+
+  double GetScore(JNIEnv* env,
+                  const base::android::JavaParamRef<jobject>& caller,
+                  const base::android::JavaParamRef<jstring>& jurl) const;
+
+  void ResetScoreForURL(JNIEnv* env,
+                        const base::android::JavaParamRef<jobject>& caller,
+                        const base::android::JavaParamRef<jstring>& jurl,
+                        double score);
+
+ private:
+  base::android::ScopedJavaGlobalRef<jobject> java_service_;
+  SiteEngagementService* service_;
+
+  DISALLOW_COPY_AND_ASSIGN(SiteEngagementServiceAndroid);
+};
+
+#endif  // CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_SERVICE_ANDROID_H_