[TTS] Write initial Tap-features to Ranker.

chrome/browser/android/contextualsearch/contextual_search_ranker_logger_impl.h

+// Copyright 2017 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_CONTEXTUAL_SEARCH_RANKER_LOGGER_IMPL_H_
+#define CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_RANKER_LOGGER_IMPL_H_
+
+#include "base/android/jni_android.h"
+#include "components/ukm/ukm_service.h"
+#include "url/gurl.h"
+
+class GURL;
+
+namespace ukm {
+class UkmService;
+}  // namespace ukm
+
+class ContextualSearchRankerLoggerImpl {
+ public:
+  ContextualSearchRankerLoggerImpl(JNIEnv* env, jobject obj);
+  ~ContextualSearchRankerLoggerImpl();
+
+  // Calls the destructor.  Should be called when this native object is no
+  // longer needed.
+  void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
+
+  // Sets up the logging and Ranker for Contextual Search features using the
+  // given details.
+  // |j_base_page_url| is the URL of the Contextual Search base-page (where the
+  // user might tap.
+  void SetupLoggingAndRanker(
+      JNIEnv* env,
+      jobject obj,
+      const base::android::JavaParamRef<jstring>& j_base_page_url);
+
+  // Logs a long value with the given feature name.
+  void LogLong(JNIEnv* env,
+               jobject obj,
+               const base::android::JavaParamRef<jstring>& j_feature,
+               jlong j_long);
+
+  // Writes the currently logged data and resets the current builder to be
+  // ready to start logging the next set of data.
+  void WriteLogAndReset(JNIEnv* env, jobject obj);
+
+ private:
+  // Set the UKM service and base-page URL.
+  // TODO(donnd): write a test, using this to inject a test-ukm-service.
+  void SetUkmService(ukm::UkmService* ukm_service, const GURL& page_url);
+
+  // Used to log URL-keyed metrics. This pointer will outlive |this|.
+  ukm::UkmService* ukm_service_;
+
+  // The UKM source ID being used for this session.
+  int32_t source_id_;
+
+  // The entry builder for the current record.
+  std::unique_ptr<ukm::UkmEntryBuilder> builder_;
+
+  // The linked Java object.
+  base::android::ScopedJavaGlobalRef<jobject> java_object_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContextualSearchRankerLoggerImpl);
+};
+
+bool RegisterContextualSearchRankerLoggerImpl(JNIEnv* env);
+
+#endif  // CHROME_BROWSER_ANDROID_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_RANKER_LOGGER_IMPL_H_