Add constructors for WebAudio nodes

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index fb9037b503330289916dfb4956ee1dac297a8504..f95c53f07aecd7558e3bb5bd5db8d2b7261529bc 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -80506,6 +80506,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1549" label="MetaSetCookieWhenCSPBlocksInlineScript"/>
   <int value="1550" label="MetaRefreshWhenCSPBlocksInlineScript"/>
   <int value="1551" label="PanScrollingStart"/>
+  <int value="1552" label="AnalyserNode"/>
+  <int value="1553" label="AudioBuffer"/>
+  <int value="1554" label="AudioBufferSourceNode"/>
+  <int value="1555" label="BiquadFilterNode"/>
+  <int value="1556" label="ChannelMergerNode"/>
+  <int value="1557" label="ChannelSplitterNode"/>
+  <int value="1558" label="ConvolverNode"/>
+  <int value="1559" label="DelayNode"/>
+  <int value="1560" label="DynamicsCompressorNode"/>
+  <int value="1561" label="GainNode"/>
+  <int value="1562" label="IIRFilterNode"/>
+  <int value="1563" label="MediaElementAudioSourceNode"/>
+  <int value="1564" label="OscillatorNode"/>
+  <int value="1565" label="PannerNode"/>
+  <int value="1566" label="PeriodicWave"/>
+  <int value="1567" label="StereoPannerNode"/>
+  <int value="1568" label="WaveShaperNode"/>
 </enum>
 
 <enum name="FetchRequestMode" type="int">