Add Keyboard Latency UMA Metrics.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 8d2390a91305f963ac4fda2f743aedaa71d82852..a1fd09a794e19631c055942cadc4c29ae9600da7 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1156,13 +1156,15 @@ void RenderWidgetHostImpl::ForwardTouchEventWithLatencyInfo(
   input_router_->SendTouchEvent(touch_with_latency);
 }
 
-void RenderWidgetHostImpl::ForwardKeyboardEvent(
-    const NativeWebKeyboardEvent& key_event) {
-  ForwardKeyboardEventWithCommands(key_event, nullptr, nullptr);
+void RenderWidgetHostImpl::ForwardKeyboardEventWithLatencyInfo(
+    const NativeWebKeyboardEvent& key_event,
+    const ui::LatencyInfo& ui_latency) {
+  ForwardKeyboardEventWithCommands(key_event, ui_latency, nullptr, nullptr);
 }
 
 void RenderWidgetHostImpl::ForwardKeyboardEventWithCommands(
     const NativeWebKeyboardEvent& key_event,
+    const ui::LatencyInfo& ui_latency,
     const std::vector<EditCommand>* commands,
     bool* update_event) {
   TRACE_EVENT0("input", "RenderWidgetHostImpl::ForwardKeyboardEvent");
@@ -1239,9 +1241,8 @@ void RenderWidgetHostImpl::ForwardKeyboardEventWithCommands(
 
   if (touch_emulator_ && touch_emulator_->HandleKeyboardEvent(key_event))
     return;
-  ui::LatencyInfo latency_info(ui::SourceEventType::OTHER);
   NativeWebKeyboardEventWithLatencyInfo key_event_with_latency(key_event,
-                                                               latency_info);
+                                                               ui_latency);
   key_event_with_latency.event.isBrowserShortcut = is_shortcut;
   DispatchInputEventWithLatencyInfo(key_event, &key_event_with_latency.latency);
   // TODO(foolip): |InputRouter::SendKeyboardEvent()| may filter events, in