Whitelist data savings prefs for the reduction proxy.

BUG=411543

Review URL: https://codereview.chromium.org/691123002

Cr-Commit-Position: refs/heads/master@{#302155}

chrome/browser/extensions/api/preference/chrome_direct_setting_api.cc

@@ -26,6 +26,9 @@ class PreferenceWhitelist {
   PreferenceWhitelist() {
     whitelist_.insert("googlegeolocationaccess.enabled");
     whitelist_.insert("spdy_proxy.enabled");
+    whitelist_.insert("data_reduction.daily_original_length");
+    whitelist_.insert("data_reduction.daily_received_length");
+    whitelist_.insert("data_reduction.update_daily_lengths");
   }
 
   ~PreferenceWhitelist() {}

chrome/common/extensions/api/preferences_private.json

@@ -18,6 +18,24 @@
         "$ref": "types.private.ChromeDirectSetting",
         "value": ["spdy_proxy.enabled", {"type":"boolean"}],
         "description": "Flag to enable data usage reduction by sending requests via data reduction proxy. This preference's value is a boolean, defaulting to <code>false</code>."
+      },
+      "dataReductionDailyContentLength": {
+        "nocompile": true,
+        "$ref": "types.private.ChromeDirectSetting",
+        "value": ["data_reduction.daily_original_length", {"type":"array"}],
+        "description": "Each item contains the number uncompressed bytes through data reduction proxy per day."
+      },
+      "dataReductionDailyReceivedLength": {
+        "nocompile": true,
+        "$ref": "types.private.ChromeDirectSetting",
+        "value": ["data_reduction.daily_received_length", {"type":"array"}],
+        "description": "Each item contains the number of compressed bytes through data reduction proxy per day."
+      },
+      "dataReductionUpdateDailyLengths": {
+        "nocompile": true,
+        "$ref": "types.private.ChromeDirectSetting",
+        "value": ["data_reduction.update_daily_lengths", {"type":"boolean"}],
+        "description": "Flag to indicate that dataReductionDailyContentLength and dataReductionDailyReceivedLength must be updated with their latest values. This preference's value is a boolean, defaulting to <code>false</code>."
       }
     },
     "functions": [