Log the channel that we're on when failing due to unsupported features, to aid in debugging.

R=kalman@chromium.org


Review URL: https://chromiumcodereview.appspot.com/10837275

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151847 0039d316-1c4b-4281-b951-d872f2087c98

chrome/common/extensions/features/feature.cc

@@ -247,9 +247,11 @@ std::string Feature::GetErrorMessage(Feature::Availability result) {
           name().c_str());
     case UNSUPPORTED_CHANNEL:
       return base::StringPrintf(
-          "'%s' requires Google Chrome %s channel or newer.",
+          "'%s' requires Google Chrome %s channel or newer, and we're running "
+              "on the %s channel.",
           name().c_str(),
-          GetChannelName(channel_).c_str());
+          GetChannelName(channel_).c_str(),
+          GetChannelName(GetCurrentChannel()).c_str());
   }
 
   return "";