Add scroll units in GestureEvents.

third_party/WebKit/Source/web/WebInputEventConversion.cpp

Index: third_party/WebKit/Source/web/WebInputEventConversion.cpp
diff --git a/third_party/WebKit/Source/web/WebInputEventConversion.cpp b/third_party/WebKit/Source/web/WebInputEventConversion.cpp
index 321a5b2e649ebe09f7145ee0fa34d3b226d5b38b..5f5903449a5b0389d3d28f09ffeec18b03da1c99 100644
--- a/third_party/WebKit/Source/web/WebInputEventConversion.cpp
+++ b/third_party/WebKit/Source/web/WebInputEventConversion.cpp
@@ -204,6 +204,19 @@ PlatformGestureEventBuilder::PlatformGestureEventBuilder(Widget* widget, const W
         m_data.m_scroll.m_velocityY = e.data.scrollUpdate.velocityY;
         m_data.m_scroll.m_preventPropagation = e.data.scrollUpdate.preventPropagation;
         m_data.m_scroll.m_inertial = e.data.scrollUpdate.inertial;
+        switch (e.data.scrollUpdate.deltaUnits) {
+        case WebGestureEvent::ScrollUnits::PrecisePixels:
+            m_data.m_scroll.m_deltaUnits = ScrollGranularity::ScrollByPrecisePixel;
+            break;
+        case WebGestureEvent::ScrollUnits::Pixels:
+            m_data.m_scroll.m_deltaUnits = ScrollGranularity::ScrollByPixel;
+            break;
+        case WebGestureEvent::ScrollUnits::Page:
+            m_data.m_scroll.m_deltaUnits = ScrollGranularity::ScrollByPage;
+            break;
+        default:
+            ASSERT_NOT_REACHED();
+        }
         break;
     case WebInputEvent::GestureTap:
         m_type = PlatformEvent::GestureTap;