Index: base/metrics/user_metrics.h |
diff --git a/base/metrics/user_metrics.h b/base/metrics/user_metrics.h |
index 57356c303aa9a39e8a8d5f796404776e4b541560..bcfefb809942e203590dfd9db7672cc56f861c7c 100644 |
--- a/base/metrics/user_metrics.h |
+++ b/base/metrics/user_metrics.h |
@@ -17,6 +17,8 @@ namespace base { |
// the user metrics system. |
// Record that the user performed an action. |
+// This method *must* be called from the main thread. |
+// |
// "Action" here means a user-generated event: |
// good: "Reload", "CloseTab", and "IMEInvoked" |
// not good: "SSLDialogShown", "PageLoaded", "DiskFull" |