Continue to process AnalyserNode if inputs are silent.

third_party/WebKit/Source/modules/webaudio/AnalyserNode.h

Index: third_party/WebKit/Source/modules/webaudio/AnalyserNode.h
diff --git a/third_party/WebKit/Source/modules/webaudio/AnalyserNode.h b/third_party/WebKit/Source/modules/webaudio/AnalyserNode.h
index 6c80967316f6ae626f740f60e3d65b1923d5e0e8..5fc6fbff3e71cdb43cd34fd7fa2c04dbae48434a 100644
--- a/third_party/WebKit/Source/modules/webaudio/AnalyserNode.h
+++ b/third_party/WebKit/Source/modules/webaudio/AnalyserNode.h
@@ -75,8 +75,20 @@ class AnalyserHandler final : public AudioBasicInspectorHandler {
     m_analyser.getByteTimeDomainData(array);
   }
 
+  // AnalyserNode needs special handling when updating the pull status
+  // because the node must get pulled even if there are no inputs or
+  // outputs so that the internal state is properly updated with the
+  // correct time data.
+  void updatePullStatus() override;
+
  private:
   AnalyserHandler(AudioNode&, float sampleRate);
+  bool propagatesSilence() const {
+    // An AnalyserNode does actually propogate silence, but to get the
+    // time and FFT data updated correctly, process() needs to be
+    // called even if all the inputs are silent.
+    return false;
+  }
 
   RealtimeAnalyser m_analyser;
 };