Implement tail processing for AudioNodes

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

Index: third_party/WebKit/Source/modules/webaudio/PannerNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/PannerNode.cpp b/third_party/WebKit/Source/modules/webaudio/PannerNode.cpp
index 94a4364a7df6806e1717e8e8065a67a3464b7536..77991b225b56487a65e1a16eea1ef9226fcfc8ac 100644
--- a/third_party/WebKit/Source/modules/webaudio/PannerNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/PannerNode.cpp
@@ -103,7 +103,7 @@ PannerHandler::~PannerHandler() {
 void PannerHandler::Process(size_t frames_to_process) {
   AudioBus* destination = Output(0).Bus();
 
-  if (!IsInitialized() || !Input(0).IsConnected() || !panner_.get()) {
+  if (!IsInitialized() || !panner_.get()) {
     destination->Zero();
     return;
   }
@@ -638,6 +638,14 @@ void PannerHandler::UpdateDirtyState() {
                       PannerHandler::kDistanceConeGainDirty);
   }
 }
+
+bool PannerHandler::RequiresTailProcessing() const {
+  // If there's no panner set up yet, assume we require tail
+  // processing in case the HRTF panner is set later, which does
+  // require tail processing.
+  return panner_ ? panner_->RequiresTailProcessing() : true;
+}
+
 // ----------------------------------------------------------------
 
 PannerNode::PannerNode(BaseAudioContext& context)