Move middle-click autoscroll to synthetic fling.

content/browser/renderer_host/input/gesture_event_queue.cc

 // Copyright 2014 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/input/gesture_event_queue.h"
 
 #include "base/trace_event/trace_event.h"
 #include "content/browser/renderer_host/input/touchpad_tap_suppression_controller.h"
 #include "content/browser/renderer_host/input/touchscreen_tap_suppression_controller.h"
 #include "ui/events/blink/blink_features.h"
@@ skipping 98 matching lines @@
          !ShouldDiscardFlingCancelEvent(gesture_event);
 }
 
 bool GestureEventQueue::ShouldForwardForTapSuppression(
     const GestureEventWithLatencyInfo& gesture_event) {
   switch (gesture_event.event.GetType()) {
     case WebInputEvent::kGestureFlingCancel:
       if (gesture_event.event.source_device ==
           blink::kWebGestureDeviceTouchscreen)
         touchscreen_tap_suppression_controller_.GestureFlingCancel();
-      else
+      else if (gesture_event.event.source_device ==
+               blink::kWebGestureDeviceTouchpad)
         touchpad_tap_suppression_controller_.GestureFlingCancel();
       return true;
     case WebInputEvent::kGestureTapDown:
     case WebInputEvent::kGestureShowPress:
     case WebInputEvent::kGestureTapUnconfirmed:
     case WebInputEvent::kGestureTapCancel:
     case WebInputEvent::kGestureTap:
     case WebInputEvent::kGestureDoubleTap:
     case WebInputEvent::kGestureLongPress:
     case WebInputEvent::kGestureLongTap:
@@ skipping 106 matching lines @@
   // Ack'ing an event may enqueue additional gesture events.  By ack'ing the
   // event before the forwarding of queued events below, such additional events
   // can be coalesced with existing queued events prior to dispatch.
   client_->OnGestureEventAck(event_with_latency, ack_result);
 
   const bool processed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
   if (type == WebInputEvent::kGestureFlingCancel) {
     if (event_with_latency.event.source_device ==
         blink::kWebGestureDeviceTouchscreen)
       touchscreen_tap_suppression_controller_.GestureFlingCancelAck(processed);
-    else
+    else if (event_with_latency.event.source_device ==
+             blink::kWebGestureDeviceTouchpad)
       touchpad_tap_suppression_controller_.GestureFlingCancelAck(processed);
   }
   DCHECK_LT(event_index, coalesced_gesture_events_.size());
   coalesced_gesture_events_.erase(coalesced_gesture_events_.begin() +
                                   event_index);
 
   // Events have been forwarded already.
   if (allow_multiple_inflight_events_)
     return;
 
@@ skipping 145 matching lines @@
     return 0;
 
   if (!ignore_next_ack_)
     return 1;
 
   DCHECK_GT(coalesced_gesture_events_.size(), 1U);
   return 2;
 }
 
 }  // namespace content