First version of PerformanceObserver

Source/core/timing/Performance.idl

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 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
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 11 matching lines @@
  * 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.
  */
 
+// http://w3c.github.io/performance-timeline/#entryType/index.html#idl-def-PerformanceEntryType
+enum PerformanceEntryType {
+    "composite",
+    "mark",
+    "measure",
+    "navigation",
+    "render",
+    "resource",
+    "server"
+};
+
+// http://w3c.github.io/performance-timeline/#idl-def-PerformanceObserverCallback
+callback PerformanceObserverCallback = void (PerformanceObserverEntryList entries, PerformanceObserver observer);
+
 // https://w3c.github.io/hr-time/#the-performance-interface
 
 // TODO(philipj): This interface should be [Exposed=(Window,Worker)]. Doing that
 // would allow the WorkerPerformance interface to be merged into this.
 // TODO(philipj): None of the optional DOMString arguments in this interface
 // should have a default value.
-interface Performance : EventTarget {
+[
+  GarbageCollected
+] interface Performance : EventTarget {
     DOMHighResTimeStamp now();
 
     // Performance Timeline
     // https://w3c.github.io/performance-timeline/#the-performance-interface
     // TODO(philipj): getEntries() should take an optional FilterOptions argument.
     [MeasureAs=UnprefixedPerformanceTimeline] PerformanceEntryList getEntries();
-    [MeasureAs=UnprefixedPerformanceTimeline] PerformanceEntryList getEntriesByType(DOMString entryType);
-    [MeasureAs=UnprefixedPerformanceTimeline] PerformanceEntryList getEntriesByName(DOMString name, optional DOMString entryType = null);
+    [MeasureAs=UnprefixedPerformanceTimeline] PerformanceEntryList getEntriesByType(PerformanceEntryType entryType);
+    [MeasureAs=UnprefixedPerformanceTimeline] PerformanceEntryList getEntriesByName(DOMString name, optional PerformanceEntryType entryType = null);
 
     // Resource Timing
     // https://w3c.github.io/resource-timing/#extensions-performance-interface
     // TODO(philipj): Unprefix these APIs.
     [MeasureAs=PrefixedPerformanceClearResourceTimings] void webkitClearResourceTimings();
     [MeasureAs=PrefixedPerformanceSetResourceTimingBufferSize] void webkitSetResourceTimingBufferSize(unsigned long maxSize);
     attribute EventHandler onwebkitresourcetimingbufferfull;
 
     // Navigation Timing
     // http://www.w3.org/TR/navigation-timing/#sec-window.performance-attribute
@@ skipping 11 matching lines @@
 
     [MeasureAs=UnprefixedUserTiming, RaisesException] void measure(DOMString measureName, optional DOMString startMark = null, optional DOMString endMark = null);
     [MeasureAs=UnprefixedUserTiming] void clearMeasures(optional DOMString measureName = null);
 
     // Frame Timing
     // https://w3c.github.io/frame-timing/#extensions-performance-interface
     [RuntimeEnabled=FrameTimingSupport, MeasureAs=PerformanceFrameTiming] void clearFrameTimings();
     [RuntimeEnabled=FrameTimingSupport, MeasureAs=PerformanceFrameTiming] void setFrameTimingBufferSize(unsigned long maxSize);
     [RuntimeEnabled=FrameTimingSupport] attribute EventHandler onframetimingbufferfull;
 
+    // Performance Observer
+    // http://w3c.github.io/performance-timeline/#extensions-to-the-performance-interface-1
+    [Custom, RuntimeEnabled=PerformanceObserverSupport] PerformanceObserver createPerformanceObserver(PerformanceObserverCallback callback);
+
     // TODO(philipj): There is no spec for the Memory Info API, see blink-dev:
     // https://groups.google.com/a/chromium.org/d/msg/blink-dev/g5YRCGpC9vs/b4OJz71NmPwJ
     [Measure] readonly attribute MemoryInfo memory;
 };