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

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

Index: third_party/WebKit/Source/core/timing/PerformanceLongTaskTiming.cpp
diff --git a/third_party/WebKit/public/platform/WebEffectiveConnectionType.h b/third_party/WebKit/Source/core/timing/PerformanceLongTaskTiming.cpp
similarity index 78%
copy from third_party/WebKit/public/platform/WebEffectiveConnectionType.h
copy to third_party/WebKit/Source/core/timing/PerformanceLongTaskTiming.cpp
index 648777e7bd1b0fcaf51a9a06d98f141795e988ab..c6fb7e5a21d2d78f8c740187b8142a0ec405fad1 100644
--- a/third_party/WebKit/public/platform/WebEffectiveConnectionType.h
+++ b/third_party/WebKit/Source/core/timing/PerformanceLongTaskTiming.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2016 Google Inc. All rights reserved.
+ * Copyright (C) 2016 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -28,21 +29,23 @@
  * 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)
+{
+}
 
-} // namespace blink
+PerformanceLongTaskTiming::~PerformanceLongTaskTiming()
+{
+}
+
+DEFINE_TRACE(PerformanceLongTaskTiming)
+{
+    PerformanceEntry::trace(visitor);
+}
 
-#endif // WebEffectiveConnectionType_h
+} // namespace blink