Removing Scroll user actions because they are extremely spammy.

content/browser/renderer_host/render_widget_host_view_event_handler.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_event_handler.h"
 
 #include "base/metrics/user_metrics_action.h"
 #include "content/browser/renderer_host/input/touch_selection_controller_client_aura.h"
 #include "content/browser/renderer_host/overscroll_controller.h"
 #include "content/browser/renderer_host/render_view_host_delegate.h"
@@ skipping 395 matching lines @@
       host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
           host_view_, &gesture_event,
           ui::LatencyInfo(ui::SourceEventType::WHEEL));
       host_->delegate()->GetInputEventRouter()->RouteMouseWheelEvent(
           host_view_, &mouse_wheel_event, *event->latency());
     } else {
       host_->ForwardGestureEvent(gesture_event);
       host_->ForwardWheelEventWithLatencyInfo(mouse_wheel_event,
                                               *event->latency());
     }
-    RecordAction(base::UserMetricsAction("TrackpadScroll"));
   } else if (event->type() == ui::ET_SCROLL_FLING_START ||
              event->type() == ui::ET_SCROLL_FLING_CANCEL) {
     blink::WebGestureEvent gesture_event = ui::MakeWebGestureEvent(
         *event, base::Bind(&GetScreenLocationFromEvent));
     if (ShouldRouteEvent(event)) {
       host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
           host_view_, &gesture_event,
           ui::LatencyInfo(ui::SourceEventType::WHEEL));
     } else {
       host_->ForwardGestureEvent(gesture_event);
@@ skipping 90 matching lines @@
   }
 
   if (gesture.type() != blink::WebInputEvent::Undefined) {
     if (ShouldRouteEvent(event)) {
       host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
           host_view_, &gesture, *event->latency());
     } else {
       host_->ForwardGestureEventWithLatencyInfo(gesture, *event->latency());
     }
 
-    if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN ||
-        event->type() == ui::ET_GESTURE_SCROLL_UPDATE ||
-        event->type() == ui::ET_GESTURE_SCROLL_END) {
+    if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN) {
       RecordAction(base::UserMetricsAction("TouchscreenScroll"));
     } else if (event->type() == ui::ET_SCROLL_FLING_START) {
       RecordAction(base::UserMetricsAction("TouchscreenScrollFling"));
     }
   }
 
   // If a gesture is not processed by the webpage, then WebKit processes it
   // (e.g. generates synthetic mouse events).
   event->SetHandled();
 }
@@ skipping 320 matching lines @@
   host_->ForwardWheelEventWithLatencyInfo(event, latency);
 }
 
 void RenderWidgetHostViewEventHandler::ProcessTouchEvent(
     const blink::WebTouchEvent& event,
     const ui::LatencyInfo& latency) {
   host_->ForwardTouchEventWithLatencyInfo(event, latency);
 }
 
 }  // namespace content