[Autofill] Enable client-side pruning of old autocomplete data.

chrome/browser/webdata/autocomplete_syncable_service.cc

 // 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.
 
 #include "chrome/browser/webdata/autocomplete_syncable_service.h"
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/webdata/autofill_table.h"
 #include "chrome/browser/webdata/web_data_service.h"
 #include "chrome/browser/webdata/web_database.h"
 #include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/chrome_version_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "net/base/escape.h"
 #include "sync/api/sync_error.h"
 #include "sync/api/sync_error_factory.h"
 #include "sync/protocol/autofill_specifics.pb.h"
 #include "sync/protocol/sync.pb.h"
 
 using content::BrowserThread;
 
@@ skipping 48 matching lines @@
     } else {
       new_timestamps->insert(new_timestamps->begin(),
                              timestamps.begin(),
                              timestamps.end());
       return false;
     }
   }
 }
 
 bool ShouldCullSyncedData() {
+  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
+
   // To set probability to 10% - set it to 0.1, 5% to 0.05, etc.
-  static double kCullingProbability = 0.0;
-  return (base::RandDouble() < kCullingProbability);
+  double culling_probability;

[tim (not reviewing), 2012/11/02 17:46:11]

It's best to initialize (to 0, I suppose).

[Ilya Sherman, 2012/11/02 23:12:34]

Done.

+  if (channel == chrome::VersionInfo::CHANNEL_CANARY)
+    culling_probability = 1.0;
+  else if (channel == chrome::VersionInfo::CHANNEL_DEV)
+    culling_probability = 0.2;
+  else
+    culling_probability = 0.0;
+
+  return (base::RandDouble() < culling_probability);
 }
 
 }  // namespace
 
 AutocompleteSyncableService::AutocompleteSyncableService(
     WebDataService* web_data_service)
     : web_data_service_(web_data_service) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
   DCHECK(web_data_service_);
   notification_registrar_.Add(
@@ skipping 355 matching lines @@
                            UTF16ToUTF8(entry.key().value())));
   return syncer::SyncData::CreateLocalData(tag, tag, autofill_specifics);
 }
 
 // static
 std::string AutocompleteSyncableService::KeyToTag(const std::string& name,
                                                   const std::string& value) {
   std::string ns(kAutofillEntryNamespaceTag);
   return ns + net::EscapePath(name) + "|" + net::EscapePath(value);
 }