[SharedArrayBuffer] Prevent SharedArrayBuffer being used in Web APIs

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

Index: third_party/WebKit/Source/modules/webaudio/PeriodicWave.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/PeriodicWave.cpp b/third_party/WebKit/Source/modules/webaudio/PeriodicWave.cpp
index d55f92cb1be9ce48800ab23a2fc2785b7c136972..5e24ff553bef183865a195ebb96e8bedf887acd7 100644
--- a/third_party/WebKit/Source/modules/webaudio/PeriodicWave.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/PeriodicWave.cpp
@@ -81,13 +81,22 @@ PeriodicWave* PeriodicWave::create(BaseAudioContext& context,
   return periodicWave;
 }
 
-PeriodicWave* PeriodicWave::create(BaseAudioContext& context,
-                                   DOMFloat32Array* real,
-                                   DOMFloat32Array* imag,
-                                   bool disableNormalization,
-                                   ExceptionState& exceptionState) {
+PeriodicWave* PeriodicWave::create(
+    BaseAudioContext& context,
+    const MaybeShared<DOMFloat32Array>& realMaybeShared,
+    const MaybeShared<DOMFloat32Array>& imagMaybeShared,
+    bool disableNormalization,
+    ExceptionState& exceptionState) {
   DCHECK(isMainThread());
 
+  if (realMaybeShared.isShared() || imagMaybeShared.isShared()) {
+    exceptionState.throwTypeError(
+        "real and imag should not be backed by a SharedArrayBuffer.");
+    return nullptr;
+  }
+  DOMFloat32Array* real = realMaybeShared.viewNotShared();
+  DOMFloat32Array* imag = imagMaybeShared.viewNotShared();
+
   return create(context, real->length(), real->data(), imag->length(),
                 imag->data(), disableNormalization, exceptionState);
 }