Adding setting suggestion ranker.

Test: RunSettingsGoogleRoboTests
This is currently behind a flag and it is no-op CL.

Change-Id: Ieed3e5a9c3c2fbb0ce1bfea77c588b04778540eb

src/com/android/settings/core/instrumentation/MetricsFeatureProviderImpl.java

@@ -34,6 +34,7 @@ public class MetricsFeatureProviderImpl implements MetricsFeatureProvider {
 
     protected void installLogWriters() {
         mLoggerWriters.add(new EventLogWriter());
+        mLoggerWriters.add(new SettingSuggestionsLogWriter());
     }
 
     @Override

src/com/android/settings/core/instrumentation/SettingSuggestionsLogWriter.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.core.instrumentation;
+
+import android.content.Context;
+import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
+import com.android.internal.logging.MetricsLogger;
+import com.android.settings.suggestions.EventStore;
+
+/**
+ * {@link LogWriter} that writes setting suggestion related logs.
+ */
+public class SettingSuggestionsLogWriter implements LogWriter {
+
+    private EventStore mEventStore;
+
+    @Override
+    public void visible(Context context, int category) {
+    }
+
+    @Override
+    public void hidden(Context context, int category) {
+    }
+
+    @Override
+    public void action(Context context, int category) {
+    }
+
+    @Override
+    public void action(Context context, int category, int value) {
+    }
+
+    @Override
+    public void action(Context context, int category, boolean value) {
+    }
+
+    @Override
+    public void action(Context context, int category, String pkg) {
+        if (mEventStore == null) {
+            mEventStore = new EventStore(context);
+        }
+        switch (category) {
+            case MetricsEvent.ACTION_SHOW_SETTINGS_SUGGESTION:
+                mEventStore.writeEvent(pkg, EventStore.EVENT_SHOWN);
+                break;
+            case MetricsEvent.ACTION_SETTINGS_DISMISS_SUGGESTION:
+                mEventStore.writeEvent(pkg, EventStore.EVENT_DISMISSED);
+                break;
+            case MetricsEvent.ACTION_SETTINGS_SUGGESTION:
+                mEventStore.writeEvent(pkg, EventStore.EVENT_CLICKED);
+                break;
+        }
+    }
+
+    @Override
+    public void count(Context context, String name, int value) {
+    }
+
+    @Override
+    public void histogram(Context context, String name, int bucket) {
+    }
+
+}