--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -184,16 +184,17 @@
 #endif
 
 #if !defined(WM_DPICHANGED)
 #define WM_DPICHANGED 0x02E0
 #endif
 
 #include "mozilla/layers/APZCTreeManager.h"
 #include "mozilla/layers/InputAPZContext.h"
+#include "mozilla/layers/ScrollInputMethods.h"
 #include "ClientLayerManager.h"
 #include "InputData.h"
 
 #include "mozilla/Telemetry.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
 using namespace mozilla::gfx;
@@ -6540,16 +6541,18 @@ bool nsWindow::OnGesture(WPARAM wParam, 
     wheelEvent.button      = 0;
     wheelEvent.time        = ::GetMessageTime();
     wheelEvent.timeStamp   = GetMessageTimeStamp(wheelEvent.time);
     wheelEvent.inputSource = nsIDOMMouseEvent::MOZ_SOURCE_TOUCH;
 
     bool endFeedback = true;
 
     if (mGesture.PanDeltaToPixelScroll(wheelEvent)) {
+      mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
+          (uint32_t) ScrollInputMethod::MainThreadTouch);
       DispatchEvent(&wheelEvent, status);
     }
 
     if (mDisplayPanFeedback) {
       mGesture.UpdatePanFeedbackX(mWnd,
                                   DeprecatedAbs(RoundDown(wheelEvent.overflowDeltaX)),
                                   endFeedback);
       mGesture.UpdatePanFeedbackY(mWnd,