Snackbar for promoting Data Saver to existing users

chrome/android/java/src/org/chromium/chrome/browser/preferences/datareduction/DataReductionProxyUma.java

 // Copyright 2015 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.
 
 package org.chromium.chrome.browser.preferences.datareduction;
 
 import org.chromium.base.metrics.RecordHistogram;
 
 /**
  * Centralizes UMA data collection for the Data Reduction Proxy.
  */
 public class DataReductionProxyUma {
-    // Represent the possible user actions in the promo and settings menu. This must
-    // remain in sync with DataReductionProxy.UIAction in
+
+    public static final String UI_ACTION_HISTOGRAM_NAME = "DataReductionProxy.UIAction";
+    public static final String SNACKBAR_HISTOGRAM_NAME = "DataReductionProxy.SnackbarPromo";
+    public static final String PREVIEWS_HISTOGRAM_NAME = "Previews.ContextMenuAction.LoFi";
+
+    // Represent the possible user actions in the various data reduction promos and settings menu.
+    // This must remain in sync with DataReductionProxy.UIAction in
     // tools/metrics/histograms/histograms.xml.
     public static final int ACTION_ENABLED = 0;
     // The value of 1 is reserved for an iOS-specific action. Values 2 and 3 are
     // deprecated promo actions.
     public static final int ACTION_DISMISSED = 4;
     public static final int ACTION_OFF_TO_OFF = 5;
     public static final int ACTION_OFF_TO_ON = 6;
     public static final int ACTION_ON_TO_OFF = 7;
     public static final int ACTION_ON_TO_ON = 8;
     public static final int ACTION_FRE_ENABLED = 9;
     public static final int ACTION_FRE_DISABLED = 10;
     public static final int ACTION_INFOBAR_ENABLED = 11;
     public static final int ACTION_INFOBAR_DISMISSED = 12;
-    public static final int ACTION_INDEX_BOUNDARY = 13;
+    public static final int ACTION_SNACKBAR_LINK_CLICKED = 13;
+    public static final int ACTION_SNACKBAR_LINK_CLICKED_DISABLED = 14;
+    public static final int ACTION_SNACKBAR_DISMISSED = 15;
+    public static final int ACTION_INDEX_BOUNDARY = 16;
 
     // Represent the possible Lo-Fi context menu user actions. This must remain in sync with
     // Previews.ContextMenuAction.LoFi in tools/metrics/histograms/histograms.xml.
     public static final int ACTION_LOFI_LOAD_IMAGE_CONTEXT_MENU_SHOWN = 0;
     public static final int ACTION_LOFI_LOAD_IMAGE_CONTEXT_MENU_CLICKED = 1;
     public static final int ACTION_LOFI_LOAD_IMAGE_CONTEXT_MENU_CLICKED_ON_PAGE = 2;
     public static final int ACTION_LOFI_LOAD_IMAGES_CONTEXT_MENU_SHOWN = 3;
     public static final int ACTION_LOFI_LOAD_IMAGES_CONTEXT_MENU_CLICKED = 4;
     public static final int ACTION_LOFI_CONTEXT_MENU_INDEX_BOUNDARY = 5;
+
     /**
      * Record the DataReductionProxy.UIAction histogram.
      * @param action User action at the promo, first run experience, or settings screen
      */
     public static void dataReductionProxyUIAction(int action) {
         assert action >= 0 && action < ACTION_INDEX_BOUNDARY;
         RecordHistogram.recordEnumeratedHistogram(
-                "DataReductionProxy.UIAction", action,
+                UI_ACTION_HISTOGRAM_NAME, action,
                 DataReductionProxyUma.ACTION_INDEX_BOUNDARY);
     }
 
     /**
+     * Record the DataReductionProxy.SnackbarPromo histogram.
+     * @param contentLength The content length in MB of the promo that was shown.
+     */
+    public static void dataReductionProxySnackbarPromo(int contentLength) {
+        RecordHistogram.recordCustomCountHistogram(
+                SNACKBAR_HISTOGRAM_NAME, contentLength, 1, 10000, 200);
+    }
+
+    /**
      * Record the Previews.ContextMenuAction.LoFi histogram.
      * @param action LoFi user action on the context menu
      */
     public static void previewsLoFiContextMenuAction(int action) {
         assert action >= 0 && action < ACTION_LOFI_CONTEXT_MENU_INDEX_BOUNDARY;
         RecordHistogram.recordEnumeratedHistogram(
-                "Previews.ContextMenuAction.LoFi", action,
+                PREVIEWS_HISTOGRAM_NAME, action,
                 ACTION_LOFI_CONTEXT_MENU_INDEX_BOUNDARY);
     }
 }