Enabling sampling of UMA and crash reports on Android.

chrome/browser/metrics/chrome_metrics_services_manager_client.cc

 // 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.
 
 #include "chrome/browser/metrics/chrome_metrics_services_manager_client.h"
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 16 matching lines @@
 
 namespace {
 
 // Name of the variations param that defines the sampling rate.
 const char kRateParamName[] = "sampling_rate_per_mille";
 
 // Metrics reporting feature. This feature, along with user consent, controls if
 // recording and reporting are enabled. If the feature is enabled, but no
 // consent is given, then there will be no recording or reporting.
 const base::Feature kMetricsReportingFeature{"MetricsReporting",
-                                             base::FEATURE_ENABLED_BY_DEFAULT};
+                                             base::FEATURE_DISABLED_BY_DEFAULT};

[Ilya Sherman, 2016/08/24 05:02:50]

Hmm, why disabled by default?

[jwd, 2016/08/24 15:06:28]

Oops, was doing that for manual testing, slipped into the upload.

 
 // Posts |GoogleUpdateSettings::StoreMetricsClientInfo| on blocking pool thread
 // because it needs access to IO and cannot work from UI thread.
 void PostStoreMetricsClientInfo(const metrics::ClientInfo& client_info) {
   content::BrowserThread::GetBlockingPool()->PostTask(
       FROM_HERE,
       base::Bind(&GoogleUpdateSettings::StoreMetricsClientInfo, client_info));
 }
 
 // Only clients that were given an opt-out metrics-reporting consent flow are
@@ skipping 127 matching lines @@
 ChromeMetricsServicesManagerClient::GetMetricsStateManager() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!metrics_state_manager_) {
     metrics_state_manager_ = metrics::MetricsStateManager::Create(
         local_state_, enabled_state_provider_.get(),
         base::Bind(&PostStoreMetricsClientInfo),
         base::Bind(&GoogleUpdateSettings::LoadMetricsClientInfo));
   }
   return metrics_state_manager_.get();
 }