Change UMA proto product field to be an int32.

components/metrics/metrics_service_client.h

Index: components/metrics/metrics_service_client.h
diff --git a/components/metrics/metrics_service_client.h b/components/metrics/metrics_service_client.h
index 465cb01fe67dc80c757c9e702c2ade196131303a..4289bae899395eb823b2856d983912ed7f6d6357 100644
--- a/components/metrics/metrics_service_client.h
+++ b/components/metrics/metrics_service_client.h
@@ -5,6 +5,7 @@
 #ifndef COMPONENTS_METRICS_METRICS_SERVICE_CLIENT_H_
 #define COMPONENTS_METRICS_METRICS_SERVICE_CLIENT_H_
 
+#include <stdint.h>
 #include <string>
 
 #include "base/basictypes.h"
@@ -30,6 +31,11 @@ class MetricsServiceClient {
   // Whether there's an "off the record" (aka "Incognito") session active.
   virtual bool IsOffTheRecordSessionActive() = 0;
 
+  // Returns the product value to use in uploaded reports, which will be used to
+  // set the ChromeUserMetricsExtension.product field. See comments on that
+  // field on why it's an int32 rather than an enum.
+  virtual int32_t GetProduct() = 0;
+
   // Returns the current application locale (e.g. "en-US").
   virtual std::string GetApplicationLocale() = 0;