Add Pepper flag to UMA plugin records.

chrome/common/metrics/proto/system_profile.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.
 //
 // Stores information about the user's brower and system configuration.
 // The system configuration fields are recorded once per client session.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
@@ skipping 301 matching lines @@
     optional string name = 1;
     optional string filename = 2;
 
     // The plugin's version.
     optional string version = 3;
 
     // True if the plugin is disabled.
     // If a client has multiple local Chrome user accounts, this is logged based
     // on the first user account launched during the current session.
     optional bool is_disabled = 4;
+    
+    // True if the plugin is PPAPI.
+    optional bool is_pepper = 5;
   }
   repeated Plugin plugin = 7;
 
   // Figures that can be used to generate application stability metrics.
   // All values are counts of events since the last time that these
   // values were reported.
   message Stability {
     // Total amount of time that the program was running, in seconds.
     optional int64 uptime_sec = 1;
 
@@ skipping 96 matching lines @@
     // The name of the field trial, as a 32-bit identifier.
     // Currently, the identifier is a hash of the field trial's name.
     optional fixed32 name_id = 1;
 
     // The user's group within the field trial, as a 32-bit identifier.
     // Currently, the identifier is a hash of the group's name.
     optional fixed32 group_id = 2;
   }
   repeated FieldTrial field_trial = 9;
 }