[TTS] Record CTR by week and 28-day intervals.

chrome/browser/android/contextualsearch/ctr_suppression.h

+// 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_ANDROID_CONTEXTUALSEARCH_CTR_SUPPRESSION_H_
+#define CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_CTR_SUPPRESSION_H_
+
+#include <stddef.h>
+
+#include "base/android/jni_android.h"
+#include "components/contextual_search/browser/ctr_aggregator.h"
+#include "components/contextual_search/browser/weekly_activity_storage.h"
+
+// Provides access to aggregated click-through-rate recording for tap
+// suppression.  Implements a Java conduit to the CtrAggregator in the
+// Contextual Search component. This allows Java to access the aggregated CTR
+// values.
+// This class also provides device-specific integer storage through its
+// associated Java class as required to implement the WeeklyActivityStorage.
+class CtrSuppression : public contextual_search::WeeklyActivityStorage {
+ public:
+  // Constructs a new CtrSuppression linked to the given Java object.
+  CtrSuppression(JNIEnv* env, jobject obj);
+  ~CtrSuppression() override;
+
+  // Calls the destructor.  Should be called when this native object is no
+  // longer needed.
+  void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
+
+  // These methods all just call through to the |CtrAggregator| method of the
+  // same name.
+  void RecordImpression(JNIEnv* env,
+                        const base::android::JavaParamRef<jobject>& obj,
+                        jboolean did_click);
+  jint GetCurrentWeekNumber(JNIEnv* env,
+                            const base::android::JavaParamRef<jobject>& obj);
+  jboolean HasPreviousWeekData(JNIEnv* env,
+                               const base::android::JavaParamRef<jobject>& obj);
+  jint GetPreviousWeekImpressions(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj);
+  jfloat GetPreviousWeekCtr(JNIEnv* env,
+                            const base::android::JavaParamRef<jobject>& obj);
+  jboolean HasPrevious28DayData(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj);
+  jint GetPrevious28DayImpressions(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj);
+  jfloat GetPrevious28DayCtr(JNIEnv* env,
+                             const base::android::JavaParamRef<jobject>& obj);
+
+  // WeeklyActivityStorage Overrides.
+  int ReadStorage(std::string storage_bucket) override;
+  void WriteStorage(std::string storage_bucket, int value) override;
+
+ private:
+  // The CtrAggregator that we forward requests to.
+  std::unique_ptr<contextual_search::CtrAggregator> aggregator_;
+
+  // The linked Java object.
+  base::android::ScopedJavaGlobalRef<jobject> java_object_;
+
+  DISALLOW_COPY_AND_ASSIGN(CtrSuppression);
+};
+
+bool RegisterCtrSuppression(JNIEnv* env);
+
+#endif  // CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_CTR_SUPPRESSION_H_