Function to count dialog box creations.

chrome/browser/ui/browser_dialogs.h

Index: chrome/browser/ui/browser_dialogs.h
diff --git a/chrome/browser/ui/browser_dialogs.h b/chrome/browser/ui/browser_dialogs.h
index 74351a4f6cce1ef30feb9d3135ffc938bf6949c9..a4a4dc8cc16d2db621f0b71279207cf489dafe4e 100644
--- a/chrome/browser/ui/browser_dialogs.h
+++ b/chrome/browser/ui/browser_dialogs.h
@@ -186,6 +186,15 @@ class ContentSettingBubbleViewsBridge {
 
 #endif  // TOOLKIT_VIEWS
 
+// Values used in the Dialog.Creation UMA metric. Each value represents a
+// different type of dialog box.
+// These values are written to logs. New enum values can be added, but existing
+// enums must never be renumbered or deleted and reused.
+enum class DialogIdentifier { UNKNOWN = 0, TRANSLATE = 1, MAX_VALUE };
+
+// Record an UMA metric counting the creation of a dialog box of this type.
+void RecordDialogCreation(DialogIdentifier identifier);
+
 }  // namespace chrome
 
 #if defined(OS_CHROMEOS)