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 3d5e597188c7408a5d07df7f34927b96ab9a78e0..ed3d6d81122f7f01a1bf08c0173765e0b844ec70 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -1732,7 +1732,9 @@ void RenderWidgetHostViewAndroid::SendKeyEvent(
   if (!target_host)
     return;
 
-  target_host->ForwardKeyboardEvent(event);
+  ui::LatencyInfo latency_info(ui::SourceEventType::KEY_PRESS);
+  latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
+  target_host->ForwardKeyboardEventWithLatencyInfo(event, latency_info);
 }
 
 void RenderWidgetHostViewAndroid::SendMouseEvent(