Updating GetChannel in BlimpMetricsServiceClient so metrics will display

blimp/engine/app/blimp_metrics_service_client.cc

Index: blimp/engine/app/blimp_metrics_service_client.cc
diff --git a/blimp/engine/app/blimp_metrics_service_client.cc b/blimp/engine/app/blimp_metrics_service_client.cc
index 019e54d3d2ebb735c6f1e320c7182809a87d87ee..6149b5a333eab772900fc8cf32679a358101c0fe 100644
--- a/blimp/engine/app/blimp_metrics_service_client.cc
+++ b/blimp/engine/app/blimp_metrics_service_client.cc
@@ -118,8 +118,11 @@ bool BlimpMetricsServiceClient::GetBrand(std::string* brand_code) {
 }
 
 metrics::SystemProfileProto::Channel BlimpMetricsServiceClient::GetChannel() {
-  // Blimp engine does not have channel info yet.
-  return metrics::SystemProfileProto::CHANNEL_UNKNOWN;
+  // Blimp engine does not have channel info yet, however metrics data with
+  // CHANNEL_UNKNOWN is filtered in metrics visualization tools since the value
+  // typically implies a non-official build.
+  // Using CHANNEL_CANARY as a work around until channel is set here.
+  return metrics::SystemProfileProto::CHANNEL_CANARY;
 }
 
 std::string BlimpMetricsServiceClient::GetVersionString() {