Add a passthrough touch event queue.

content/browser/renderer_host/input/input_router_impl.cc

 // Copyright 2013 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/input_router_impl.h"
 
 #include <math.h>
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "content/browser/renderer_host/input/gesture_event_queue.h"
 #include "content/browser/renderer_host/input/input_ack_handler.h"
 #include "content/browser/renderer_host/input/input_router_client.h"
 #include "content/browser/renderer_host/input/legacy_touch_event_queue.h"
+#include "content/browser/renderer_host/input/passthrough_touch_event_queue.h"
 #include "content/browser/renderer_host/input/touch_event_queue.h"
 #include "content/browser/renderer_host/input/touchpad_tap_suppression_controller.h"
 #include "content/common/content_constants_internal.h"
 #include "content/common/edit_command.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "content/common/input/touch_action.h"
 #include "content/common/input/web_touch_event_traits.h"
 #include "content/common/input_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/notification_service.h"
@@ skipping 54 matching lines @@
       frame_tree_node_id_(-1),
       select_message_pending_(false),
       move_caret_pending_(false),
       current_ack_source_(ACK_SOURCE_NONE),
       flush_requested_(false),
       active_renderer_fling_count_(0),
       touch_scroll_started_sent_(false),
       wheel_event_queue_(this,
                          base::FeatureList::IsEnabled(
                              features::kTouchpadAndWheelScrollLatching)),
-      touch_event_queue_(new LegacyTouchEventQueue(this, config.touch_config)),
       gesture_event_queue_(this, this, config.gesture_config),
       device_scale_factor_(1.f) {
+  if (base::FeatureList::IsEnabled(features::kRafAlignedTouchInputEvents))
+    touch_event_queue_.reset(
+        new PassthroughTouchEventQueue(this, config.touch_config));
+  else
+    touch_event_queue_.reset(
+        new LegacyTouchEventQueue(this, config.touch_config));
+
   DCHECK(sender);
   DCHECK(client);
   DCHECK(ack_handler);
   UpdateTouchAckTimeoutEnabled();
 }
 
 InputRouterImpl::~InputRouterImpl() {
 }
 
 bool InputRouterImpl::SendInput(std::unique_ptr<IPC::Message> message) {
@@ skipping 554 matching lines @@
         DCHECK(global_touch_position_.find(touch_point->id) ==
                global_touch_position_.end());
         global_touch_position_[touch_point->id] = gfx::Point(
             touch_point->screenPosition.x, touch_point->screenPosition.y);
       }
     }
   }
 }
 
 }  // namespace content