Add data reduction functionality to all platforms.

components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.cc

 // Copyright 2014 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.
 
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/metrics/histogram.h"
@@ skipping 56 matching lines @@
                                 bypass_type, BYPASS_EVENT_TYPE_MAX);
     } else {
       UMA_HISTOGRAM_ENUMERATION("DataReductionProxy.BypassTypeFallback",
                                 bypass_type, BYPASS_EVENT_TYPE_MAX);
     }
   }
 }
 
 DataReductionProxyUsageStats::DataReductionProxyUsageStats(
     DataReductionProxyParams* params,
-    MessageLoopProxy* ui_thread_proxy)
+    scoped_refptr<MessageLoopProxy> ui_thread_proxy)

[Not at Google. Contact bengr, 2014/09/05 21:24:35]

FYI, I had to make this change to get it to build on desktop. Unless I change
MessageLoopProxy* to scoped_refptr<MessageLoopProxy>, this compiles only for
Android, and not desktop.

This was necessasitated by cl https://codereview.chromium.org/510323002

[Ryan Sleevi, 2014/09/05 21:28:31]

This should be a const-ref. The only pass by value type is scoped_ptr - all else
get const-ref, including scoped_refptr

[Not at Google. Contact bengr, 2014/09/05 22:08:58]

Done. For my own edification, can you please explain the reasoning behind this
rule.

     : data_reduction_proxy_params_(params),
       last_bypass_type_(BYPASS_EVENT_TYPE_MAX),
       triggering_request_(true),
       ui_thread_proxy_(ui_thread_proxy),
       eligible_num_requests_through_proxy_(0),
       actual_num_requests_through_proxy_(0),
       unavailable_(false) {
   NetworkChangeNotifier::AddNetworkChangeObserver(this);
 };
 
@@ skipping 286 matching lines @@
         default:
           break;
       }
       break;
   }
 }
 
 }  // namespace data_reduction_proxy