ChannelSplitterNode channelCount and mode are constant

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

Index: third_party/WebKit/Source/modules/webaudio/ChannelSplitterNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/ChannelSplitterNode.cpp b/third_party/WebKit/Source/modules/webaudio/ChannelSplitterNode.cpp
index 4408762461231e8b8b3d4746942cb44c50e72558..33826829ad18a90ef7c1ce07722d48195a0b81ea 100644
--- a/third_party/WebKit/Source/modules/webaudio/ChannelSplitterNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/ChannelSplitterNode.cpp
@@ -38,6 +38,9 @@ ChannelSplitterHandler::ChannelSplitterHandler(AudioNode& node,
                                                float sampleRate,
                                                unsigned numberOfOutputs)
     : AudioHandler(NodeTypeChannelSplitter, node, sampleRate) {
+  // These properties are fixed and cannot be changed by the user.
+  m_channelCount = numberOfOutputs;
+  setInternalChannelCountMode(Explicit);
   addInput();
 
   // Create a fixed number of outputs (able to handle the maximum number of
@@ -79,6 +82,34 @@ void ChannelSplitterHandler::process(size_t framesToProcess) {
   }
 }
 
+void ChannelSplitterHandler::setChannelCount(unsigned long channelCount,
+                                             ExceptionState& exceptionState) {
+  DCHECK(isMainThread());
+  BaseAudioContext::AutoLocker locker(context());
+
+  // channelCount cannot be changed from the number of outputs.
+  if (channelCount != numberOfOutputs()) {
+    exceptionState.throwDOMException(
+        InvalidStateError,
+        "ChannelSplitter: channelCount cannot be changed from " +
+            String::number(numberOfOutputs()));
+  }
+}
+
+void ChannelSplitterHandler::setChannelCountMode(
+    const String& mode,
+    ExceptionState& exceptionState) {
+  DCHECK(isMainThread());
+  BaseAudioContext::AutoLocker locker(context());
+
+  // channcelCountMode must be 'explicit'.
+  if (mode != "explicit") {
+    exceptionState.throwDOMException(
+        InvalidStateError,
+        "ChannelSplitter: channelCountMode cannot be changed from 'explicit'");
+  }
+}
+
 // ----------------------------------------------------------------
 
 ChannelSplitterNode::ChannelSplitterNode(BaseAudioContext& context,