Tiimer based phase info generated for mouse wheel events.

content/browser/renderer_host/render_widget_host_view_event_handler.h

Index: content/browser/renderer_host/render_widget_host_view_event_handler.h
diff --git a/content/browser/renderer_host/render_widget_host_view_event_handler.h b/content/browser/renderer_host/render_widget_host_view_event_handler.h
index 8f80ee7f4e049067980dec57a587c14da01b21df..4b3378a99f6bc291e505aa7b3f00e339af7471e0 100644
--- a/content/browser/renderer_host/render_widget_host_view_event_handler.h
+++ b/content/browser/renderer_host/render_widget_host_view_event_handler.h
@@ -8,6 +8,8 @@
 #include <memory>
 
 #include "base/macros.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"

[tdresser, 2017/05/18 13:49:06]

Are both of these being used?

[sahel, 2017/05/18 18:15:15]

Done.

 #include "content/common/content_export.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "ui/aura/window_tracker.h"
@@ -31,6 +33,11 @@ class TouchSelectionController;
 }
 
 namespace content {
+
+// The duration in which a synthetic wheel with zero deltas and

[tdresser, 2017/05/18 13:49:06]

in which -> after which

[sahel, 2017/05/18 18:15:15]

Done.

+// phase = |kPhaseEnded| will be sent after the last wheel event.
+const int64_t kDefaultMouseWheelLatchingTransactionMs = 100;
+
 struct ContextMenuParams;
 class OverscrollController;
 class RenderWidgetHostImpl;
@@ -185,6 +192,11 @@ class CONTENT_EXPORT RenderWidgetHostViewEventHandler
                               const ui::LatencyInfo& latency);
   void ProcessTouchEvent(const blink::WebTouchEvent& event,
                          const ui::LatencyInfo& latency);
+  void SendSyntheticWheelEventWithPhaseEnded(
+      blink::WebMouseWheelEvent last_mouse_wheel_event,
+      bool should_route_event);
+  void AddSyntheticPhase(blink::WebMouseWheelEvent& mouse_wheel_event,
+                         bool should_route_event);
 
   // Whether return characters should be passed on to the RenderWidgetHostImpl.
   bool accept_return_character_;
@@ -247,6 +259,8 @@ class CONTENT_EXPORT RenderWidgetHostViewEventHandler
   Delegate* const delegate_;
   aura::Window* window_;
 
+  base::OneShotTimer mouse_wheel_phase_timer_;

[tdresser, 2017/05/18 13:49:06]

Maybe |dispatch_synthetic_mouse_wheel_end_timer_|?

[bokan, 2017/05/18 16:47:01]

I like mouse_wheel_end_dispatch_timer_.

[sahel, 2017/05/18 18:15:15]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewEventHandler);
 };