Continue to process AnalyserNode if inputs are silent.

third_party/WebKit/Source/modules/webaudio/AudioNode.cpp

Index: third_party/WebKit/Source/modules/webaudio/AudioNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioNode.cpp b/third_party/WebKit/Source/modules/webaudio/AudioNode.cpp
index c2c0dcf494ae24892e6a15eb1b67efcfa5f5487b..a59f547aa093f82e6fe236a8df751a305c2fc187 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/AudioNode.cpp
@@ -429,9 +429,14 @@ void AudioHandler::disableOutputsIfNecessary() {
     // This needs to be handled more generally where AudioNodes have a tailTime
     // attribute. Then the AudioNode only needs to remain "active" for tailTime
     // seconds after there are no longer any active connections.
+    //
+    // The analyser node also requires special handling because we
+    // need the internal state to be updated for the time and FFT data
+    // even if it has no connections.
     if (getNodeType() != NodeTypeConvolver && getNodeType() != NodeTypeDelay &&
         getNodeType() != NodeTypeBiquadFilter &&
-        getNodeType() != NodeTypeIIRFilter) {
+        getNodeType() != NodeTypeIIRFilter &&
+        getNodeType() != NodeTypeAnalyser) {
       m_isDisabled = true;
       clearInternalStateWhenDisabled();
       for (auto& output : m_outputs)