Abstract chrome::GetChannel() through VariationsServiceClient

components/variations/service/variations_service_client.h

Index: components/variations/service/variations_service_client.h
diff --git a/components/variations/service/variations_service_client.h b/components/variations/service/variations_service_client.h
index f1a8efed18fa5f232f8217cbeb7c8a3139e5ebf1..8aa6371814960b1215f0ba6cea350123af92061c 100644
--- a/components/variations/service/variations_service_client.h
+++ b/components/variations/service/variations_service_client.h
@@ -9,6 +9,7 @@
 
 #include "base/callback.h"
 #include "base/version.h"
+#include "components/version_info/version_info.h"
 
 namespace base {
 class SequencedWorkerPool;
@@ -47,6 +48,9 @@ class VariationsServiceClient {
   virtual net::URLRequestContextGetter* GetURLRequestContext() = 0;
   virtual network_time::NetworkTimeTracker* GetNetworkTimeTracker() = 0;
 
+  // Gets the channel of the embedder.
+  virtual version_info::Channel GetChannel() = 0;
+
   // Called from VariationsService::PerformPreMainMessageLoopStartup().
   virtual void OnInitialStartup() {}
 };