Add RAIL tracing category to Chrome tracing.

ui/events/blink/input_handler_proxy.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 "ui/events/blink/input_handler_proxy.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 715 matching lines @@
       const float vx = gesture_event.data.flingStart.velocityX;
       const float vy = gesture_event.data.flingStart.velocityY;
       current_fling_velocity_ = gfx::Vector2dF(vx, vy);
       DCHECK(!current_fling_velocity_.IsZero());
       fling_curve_.reset(client_->CreateFlingAnimationCurve(
           gesture_event.sourceDevice,
           WebFloatPoint(vx, vy),
           blink::WebSize()));
       disallow_horizontal_fling_scroll_ = !vx;
       disallow_vertical_fling_scroll_ = !vy;
-      TRACE_EVENT_ASYNC_BEGIN2("input,benchmark",
+      TRACE_EVENT_ASYNC_BEGIN2("input,benchmark,rail",
                                "InputHandlerProxy::HandleGestureFling::started",
                                this, "vx", vx, "vy", vy);
       // Note that the timestamp will only be used to kickstart the animation if
       // its sufficiently close to the timestamp of the first call |Animate()|.
       has_fling_animation_started_ = false;
       fling_parameters_.startTime = gesture_event.timeStampSeconds;
       fling_parameters_.delta = WebFloatPoint(vx, vy);
       fling_parameters_.point = WebPoint(gesture_event.x, gesture_event.y);
       fling_parameters_.globalPoint =
           WebPoint(gesture_event.globalX, gesture_event.globalY);
       fling_parameters_.modifiers = gesture_event.modifiers;
       fling_parameters_.sourceDevice = gesture_event.sourceDevice;
       RequestAnimation();
       return DID_HANDLE;
     }
     case cc::InputHandler::SCROLL_UNKNOWN:
     case cc::InputHandler::SCROLL_ON_MAIN_THREAD: {
-      TRACE_EVENT_INSTANT0("input",
+      TRACE_EVENT_INSTANT0("input,rail",
                            "InputHandlerProxy::HandleGestureFling::"
                            "scroll_on_main_thread",
                            TRACE_EVENT_SCOPE_THREAD);
       gesture_scroll_on_impl_thread_ = false;
       fling_may_be_active_on_main_thread_ = true;
       client_->DidStartFlinging();
       return DID_NOT_HANDLE;
     }
     case cc::InputHandler::SCROLL_IGNORED: {
       TRACE_EVENT_INSTANT0(
-          "input",
+          "input,rail",
           "InputHandlerProxy::HandleGestureFling::ignored",
           TRACE_EVENT_SCOPE_THREAD);
       gesture_scroll_on_impl_thread_ = false;
       if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad) {
         // We still pass the curve to the main thread if there's nothing
         // scrollable, in case something
         // registers a handler before the curve is over.
         return DID_NOT_HANDLE;
       }
       return DROP_EVENT;
@@ skipping 564 matching lines @@
   // is made asynchronously, to minimize divergence between main thread and
   // impl thread event handling paths.
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&InputScrollElasticityController::ObserveGestureEventAndResult,
                  scroll_elasticity_controller_->GetWeakPtr(), gesture_event,
                  scroll_result));
 }
 
 }  // namespace ui