History: Add load-time metric for non-MD and MD History WebUI

chrome/browser/ui/webui/metrics_handler.h

Index: chrome/browser/ui/webui/metrics_handler.h
diff --git a/chrome/browser/ui/webui/metrics_handler.h b/chrome/browser/ui/webui/metrics_handler.h
index 15ad9432ceae4010281a79bbfb74ef4a2dc46ba5..ccf4f55ccd31a0d53380b0a4f31368ca30a02ab4 100644
--- a/chrome/browser/ui/webui/metrics_handler.h
+++ b/chrome/browser/ui/webui/metrics_handler.h
@@ -44,6 +44,11 @@ class MetricsHandler : public content::WebUIMessageHandler {
   // depending on the maximum value.
   void HandleRecordInHistogram(const base::ListValue* args);
 
+  // Record a millisecond time value in a histogram, similar to
+  // UMA_HISTOGRAM_TIMES. Handles times between 1ms and 10sec. |args|
+  // contains the histogram name and a value in milliseconds.
+  void HandleRecordTime(const base::ListValue* args);
+
   // Callback for the "metricsHandler:logEventTime" message.
   void HandleLogEventTime(const base::ListValue* args);