Output silence if the MediaElementAudioSourceNode has a different origin

Source/modules/webaudio/MediaElementAudioSourceNode.cpp

Index: Source/modules/webaudio/MediaElementAudioSourceNode.cpp
diff --git a/Source/modules/webaudio/MediaElementAudioSourceNode.cpp b/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
index e0812428868b5512fb97840db09ff06ab8a6941e..60361df71df07b20ac645c59a8477834b71094b8 100644
--- a/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
+++ b/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
@@ -33,6 +33,7 @@
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "platform/Logging.h"
 #include "platform/graphics/media/MediaPlayer.h"
+#include "platform/weborigin/SecurityOrigin.h"
 #include "wtf/Locker.h"
 
 // These are somewhat arbitrary limits, but we need to do some kind of sanity-checking.
@@ -123,6 +124,8 @@ void MediaElementAudioSourceNode::process(size_t numberOfFrames)
     MutexTryLocker tryLocker(m_processLock);
     if (tryLocker.locked()) {
         if (AudioSourceProvider* provider = mediaElement()->audioSourceProvider()) {
+            // Grab data from the provider so that the element continues to make progress, even if
+            // we're going to output silence anyway.
             if (m_multiChannelResampler.get()) {
                 ASSERT(m_sourceSampleRate != sampleRate());
                 m_multiChannelResampler->process(provider, outputBus, numberOfFrames);
@@ -131,6 +134,9 @@ void MediaElementAudioSourceNode::process(size_t numberOfFrames)
                 ASSERT(m_sourceSampleRate == sampleRate());
                 provider->provideInput(outputBus, numberOfFrames);
             }
+            // Output silence if we don't have access to the element.
+            if (!context()->securityOrigin()->canRequest(m_mediaElement->currentSrc()))
+                outputBus->zero();
         } else {
             // Either this port doesn't yet support HTMLMediaElement audio stream access,
             // or the stream is not yet available.