Allow use of metrics url override outside of Chromecast

components/metrics/metrics_switches.cc

Index: components/metrics/metrics_switches.cc
diff --git a/components/metrics/metrics_switches.cc b/components/metrics/metrics_switches.cc
index 1aef619d6a4a9a56e03cca597d058536f8289dd1..cbee351e883feea50031468f3c79804dd8032d2d 100644
--- a/components/metrics/metrics_switches.cc
+++ b/components/metrics/metrics_switches.cc
@@ -7,6 +7,9 @@
 namespace metrics {
 namespace switches {
 
+// Override the URL to which metrics logs are sent for debugging.
+const char kOverrideMetricsUploadUrl[] = "override-metrics-upload-url";
+
 // Forces a reset of the one-time-randomized FieldTrials on this client, also
 // known as the Chrome Variations state.
 const char kResetVariationState[] = "reset-variation-state";