Add variations filtering for is_low_end_device.

components/variations/proto/study.proto

 // Copyright (c) 2012 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package variations;
 
@@ skipping 188 matching lines @@
     PHONE   = 1;
     // Tablet-based mobile Chrome, e.g. an Android tablet or iPad.
     TABLET  = 2;
     // ChromeOS running in single-app Kiosk mode.
     KIOSK   = 3;
   }
 
   // Filtering criteria specifying whether this study is applicable to a given
   // Chrome instance.
   //
-  // Next tag: 15
+  // Next tag: 16
   message Filter {
     // The start date of the study in Unix time format. (Seconds since midnight
     // January 1, 1970 UTC). See: http://en.wikipedia.org/wiki/Unix_time
     // Ex: 1330893974  (corresponds to 2012-03-04 20:46:14Z)
     optional int64 start_date = 1;
 
     // The end date of the study in Unix time format. (Seconds since midnight
     // January 1, 1970 UTC). See: http://en.wikipedia.org/wiki/Unix_time
     // Ex: 1330893974  (corresponds to 2012-03-04 20:46:14Z)
     // Mutually exclusive with expiry_date. The difference between end_date and
@@ skipping 73 matching lines @@
     // |exclude_country| is specified. Mutually exclusive with
     // |exclude_country|.
     // Ex: ["in", "us"]
     repeated string country = 10;
 
     // List of lowercase ISO 3166-1 alpha-2 country codes that will be excluded
     // from this study. If omitted, the study applies to all countries unless
     // |country| is specified. Mutually exclusive with |country|.
     // Ex: ["in", "us"]
     repeated string exclude_country = 11;
+
+    // Specifies whether the config should apply to low-end devices only. This
+    // is currently only supported on Android.
+    optional bool is_low_end_device = 15;
   }
 
   // Filtering criteria for this study. A study that is filtered out for a given
   // client is equivalent to that study not being sent at all.
   optional Filter filter = 10;
 
   // Randomization seed to be used when |consistency| is set to PERMANENT. If
   // not specified, randomization will be done using the trial name.
   optional uint32 randomization_seed = 11;
 
   // Specifies whether the study starts as active initially, or whether it
   // requires the client to query its state before it is marked as active.
   enum ActivationType {
     // The study will be activated when its state is queried by the client.
     // This is recommended for most studies that include client code.
     ACTIVATION_EXPLICIT  = 0;
     // The study will be automatically activated when it is created. This
     // is recommended for studies that do not have any client logic.
     ACTIVATION_AUTO      = 1;
   }
 
   // Activation type for this study. Defaults to ACTIVATION_EXPLICIT if omitted.
   optional ActivationType activation_type = 12;
 }