Add Keyboard Latency UMA Metrics.

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 9dbbf15b744908106d8bad4310cbd3e6d5f87d1c..0e369107c6ce750596ef255c0132159a94eeb823 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -1736,7 +1736,13 @@ void RenderWidgetHostViewAndroid::SendKeyEvent(
   if (!target_host)
     return;
 
-  target_host->ForwardKeyboardEvent(event);
+  ui::LatencyInfo latency_info;
+  if (event.GetType() == blink::WebInputEvent::kRawKeyDown ||
+      event.GetType() == blink::WebInputEvent::kChar) {
+    latency_info.set_source_event_type(ui::SourceEventType::KEY_PRESS);
+  }
+  latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
+  target_host->ForwardKeyboardEventWithLatencyInfo(event, latency_info);
 }
 
 void RenderWidgetHostViewAndroid::SendMouseEvent(