LongTaskTiming: add idl, Experiment flag, PerformanceEntry and basic implementation

third_party/WebKit/Source/core/timing/PerformanceLongTaskTiming.cpp

 /*
  * Copyright (C) 2016 Google Inc. All rights reserved.
+ * Copyright (C) 2016 Intel Inc. All rights reserved.

[haraken, 2016/08/17 01:15:48]

Why are you adding a copyright for Intel?

Either way, we should just use the three-line copyright.

[panicker, 2016/08/17 19:00:09]

Other similar files in this directory have this copyright, so I wondered if this
directory was special. Happy to get rid of it :)
Done.

  *
  * 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
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WebEffectiveConnectionType_h
-#define WebEffectiveConnectionType_h
+#include "core/timing/PerformanceLongTaskTiming.h"
 
 namespace blink {
 
-enum class WebEffectiveConnectionType {
-    TypeUnknown,
-    TypeOffline,
-    TypeSlow2G,
-    Type2G,
-    Type3G,
-    Type4G,
-    TypeBroadband
-};
+PerformanceLongTaskTiming::PerformanceLongTaskTiming(
+    double startTime, double endTime, String frameContextUrl)
+    : PerformanceEntry(frameContextUrl, "longtask", startTime, endTime)
+{
+}
+
+PerformanceLongTaskTiming::~PerformanceLongTaskTiming()
+{
+}
+
+DEFINE_TRACE(PerformanceLongTaskTiming)
+{
+    PerformanceEntry::trace(visitor);
+}
 
 } // namespace blink
-
-#endif // WebEffectiveConnectionType_h