Continue to process AnalyserNode if inputs are silent.

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

Index: third_party/WebKit/Source/modules/webaudio/AudioBasicInspectorNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioBasicInspectorNode.cpp b/third_party/WebKit/Source/modules/webaudio/AudioBasicInspectorNode.cpp
index e1bed1d5e244a4a457395932f14b8f4925d0925d..3e08199ba33080b0072a4353ca6cee637ca39a11 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioBasicInspectorNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/AudioBasicInspectorNode.cpp
@@ -115,9 +115,13 @@ void AudioBasicInspectorHandler::updatePullStatus() {
       // automatic pull list.
       context()->deferredTaskHandler().addAutomaticPullNode(this);
       m_needAutomaticPull = true;
-    } else if (!numberOfInputConnections && m_needAutomaticPull) {
-      // The AudioBasicInspectorNode is connected to nothing, remove it from the
-      // context's automatic pull list.
+    } else if (!numberOfInputConnections && m_needAutomaticPull &&
+               getNodeType() != NodeTypeAnalyser) {
+      // The AudioBasicInspectorNode is connected to nothing and is
+      // not an AnalyserNode, remove it from the context's automatic
+      // pull list.  AnalyserNode's need to be pulled even with no
+      // inputs so that the internal state gets updated to hold the
+      // right time and FFT data.

[hongchan, 2017/02/01 01:12:11]

We should at least consider refactoring this method; we can extract the common
part to the parent class, and leave the detail in the derived one. Not an easy
task, but we should try.

[Raymond Toy, 2017/02/01 21:21:01]

Done.  But a bit of duplication.

       context()->deferredTaskHandler().removeAutomaticPullNode(this);
       m_needAutomaticPull = false;
     }