Add a switch for faking channels for Variations filtering.

chrome/browser/metrics/variations/variations_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/metrics/variations/variations_service.h"
 
 #include <set>
 
 #include "base/base64.h"
 #include "base/build_time.h"
@@ skipping 259 matching lines @@
   }
 
   local_prefs->SetString(prefs::kVariationsSeed, base64_seed_data);
   local_prefs->SetInt64(prefs::kVariationsSeedDate,
                         seed_date.ToInternalValue());
   variations_serial_number_ = seed.serial_number();
   return true;
 }
 
 // static
+chrome::VersionInfo::Channel VariationsService::GetChannelForVariations() {
+  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
+  if (channel != chrome::VersionInfo::CHANNEL_UNKNOWN)
+    return channel;
+  std::string forced_channel =
+      CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          switches::kFakeVariationsChannel);
+  if (!forced_channel.empty()) {
+    if (forced_channel == "stable")
+      channel = chrome::VersionInfo::CHANNEL_STABLE;
+    else if (forced_channel == "beta")
+      channel = chrome::VersionInfo::CHANNEL_BETA;
+    else if (forced_channel == "dev")
+      channel = chrome::VersionInfo::CHANNEL_DEV;
+    else if (forced_channel == "canary")
+      channel = chrome::VersionInfo::CHANNEL_CANARY;
+    else
+      NOTREACHED();
+  }
+  return channel;
+}
+
+// static
 bool VariationsService::ShouldAddStudy(
     const Study& study,
     const chrome::VersionInfo& version_info,
     const base::Time& reference_date) {
   if (study.has_filter()) {
-    if (!CheckStudyChannel(study.filter(), chrome::VersionInfo::GetChannel())) {
+    if (!CheckStudyChannel(study.filter(), GetChannelForVariations())) {
       DVLOG(1) << "Filtered out study " << study.name() << " due to channel.";
       return false;
     }
 
     if (!CheckStudyLocale(study.filter(),
                           g_browser_process->GetApplicationLocale())) {
       DVLOG(1) << "Filtered out study " << study.name() << " due to locale.";
       return false;
     }
 
@@ skipping 215 matching lines @@
                                       variation_id);
     }
   }
 
   trial->SetForced();
   if (IsStudyExpired(study, reference_date))
     trial->Disable();
 }
 
 }  // namespace chrome_variations