re-land the "SourceEventType added to LatencyInfo."

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 b95f069335d675d08def6a8dc8d6143098ebea1d..3c7de59f07aa8d434966576bfadd6c21bf8aa02d 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -84,6 +84,7 @@
 #include "ui/display/screen.h"
 #include "ui/events/blink/blink_event_util.h"
 #include "ui/events/blink/did_overscroll_params.h"
+#include "ui/events/blink/web_input_event_traits.h"
 #include "ui/events/gesture_detection/gesture_provider_config_helper.h"
 #include "ui/events/gesture_detection/motion_event.h"
 #include "ui/gfx/android/device_display_info.h"
@@ -843,7 +844,7 @@ bool RenderWidgetHostViewAndroid::OnTouchEvent(
 
   blink::WebTouchEvent web_event = ui::CreateWebTouchEventFromMotionEvent(
       event, result.moved_beyond_slop_region);
-  ui::LatencyInfo latency_info;
+  ui::LatencyInfo latency_info(ui::SourceEventType::TOUCH);
   latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
   host_->ForwardTouchEventWithLatencyInfo(web_event, latency_info);
 
@@ -876,9 +877,11 @@ void RenderWidgetHostViewAndroid::ResetGestureDetection() {
   std::unique_ptr<ui::MotionEvent> cancel_event = current_down_event->Cancel();
   if (gesture_provider_.OnTouchEvent(*cancel_event).succeeded) {
     bool causes_scrolling = false;
+    ui::LatencyInfo latency_info(ui::SourceEventType::TOUCH);
+    latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
     host_->ForwardTouchEventWithLatencyInfo(
         ui::CreateWebTouchEventFromMotionEvent(*cancel_event, causes_scrolling),
-        ui::LatencyInfo());
+        latency_info);
   }
 }
 
@@ -1657,7 +1660,7 @@ void RenderWidgetHostViewAndroid::SendMouseEvent(
 void RenderWidgetHostViewAndroid::SendMouseWheelEvent(
     const blink::WebMouseWheelEvent& event) {
   if (host_) {
-    ui::LatencyInfo latency_info;
+    ui::LatencyInfo latency_info(ui::SourceEventType::WHEEL);
     latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
     host_->ForwardWheelEventWithLatencyInfo(event, latency_info);
   }
@@ -1669,8 +1672,11 @@ void RenderWidgetHostViewAndroid::SendGestureEvent(
   if (overscroll_controller_)
     overscroll_controller_->Enable();
 
-  if (host_)
-    host_->ForwardGestureEventWithLatencyInfo(event, ui::LatencyInfo());
+  if (host_) {
+    ui::LatencyInfo latency_info =
+        ui::WebInputEventTraits::CreateLatencyInfoForWebGestureEvent(event);
+    host_->ForwardGestureEventWithLatencyInfo(event, latency_info);
+  }
 }
 
 void RenderWidgetHostViewAndroid::MoveCaret(const gfx::Point& point) {