Add RAIL tracing category to Chrome tracing.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2142 matching lines @@
     // case, the form submission happens before the autofill client is told
     // to unblock the password values, and so the password values are not
     // submitted. To avoid that, GestureTap is handled explicitly:
     if (inputEvent.type == WebInputEvent::GestureTap && autofillClient) {
         m_userGestureObserved = true;
         autofillClient->firstUserGestureObserved();
     }
 
     page()->frameHost().visualViewport().startTrackingPinchStats();
 
-    TRACE_EVENT1("input", "WebViewImpl::handleInputEvent", "type", inputTypeToName(inputEvent.type));
+    TRACE_EVENT1("input,rail", "WebViewImpl::handleInputEvent", "type", inputTypeToName(inputEvent.type));
     // If we've started a drag and drop operation, ignore input events until
     // we're done.
     if (m_doingDragAndDrop)
         return WebInputEventResult::HandledSuppressed;
 
     if (m_devToolsEmulator->handleInputEvent(inputEvent))
         return WebInputEventResult::HandledSuppressed;
 
     if (InspectorOverlay* overlay = inspectorOverlay()) {
         if (overlay->handleInputEvent(inputEvent))
@@ skipping 2453 matching lines @@
         return nullptr;
     return focusedFrame;
 }
 
 LocalFrame* WebViewImpl::focusedLocalFrameAvailableForIme() const
 {
     return m_imeAcceptEvents ? focusedLocalFrameInWidget() : nullptr;
 }
 
 } // namespace blink