[SharedArrayBuffer] Prevent SharedArrayBuffer being used in Web APIs

third_party/WebKit/Source/core/dom/DOMMatrix.cpp

Index: third_party/WebKit/Source/core/dom/DOMMatrix.cpp
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrix.cpp b/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
index 59c6ae4412f04aa6c0f8c2c0e4fb043a1bee1217..96e8451e42629e740f87e0ae0a1bba4ba0926d96 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
+++ b/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
@@ -39,8 +39,15 @@ DOMMatrix* DOMMatrix::create(Vector<double> sequence,
   return new DOMMatrix(sequence, sequence.size());
 }
 
-DOMMatrix* DOMMatrix::fromFloat32Array(DOMFloat32Array* float32Array,
-                                       ExceptionState& exceptionState) {
+DOMMatrix* DOMMatrix::fromFloat32Array(
+    const MaybeShared<DOMFloat32Array>& maybeShared,
+    ExceptionState& exceptionState) {
+  if (maybeShared.isShared()) {
+    exceptionState.throwTypeError(
+        "The Float32Array must not be backed by a SharedArrayBuffer.");
+    return nullptr;
+  }
+  DOMFloat32Array* float32Array = maybeShared.viewNotShared();
   if (float32Array->length() != 6 && float32Array->length() != 16) {
     exceptionState.throwTypeError(
         "The sequence must contain 6 elements for a 2D matrix or 16 elements "
@@ -50,8 +57,15 @@ DOMMatrix* DOMMatrix::fromFloat32Array(DOMFloat32Array* float32Array,
   return new DOMMatrix(float32Array->data(), float32Array->length());
 }
 
-DOMMatrix* DOMMatrix::fromFloat64Array(DOMFloat64Array* float64Array,
-                                       ExceptionState& exceptionState) {
+DOMMatrix* DOMMatrix::fromFloat64Array(
+    const MaybeShared<DOMFloat64Array>& maybeShared,
+    ExceptionState& exceptionState) {
+  if (maybeShared.isShared()) {
+    exceptionState.throwTypeError(
+        "The Float64Array must not be backed by a SharedArrayBuffer.");
+    return nullptr;
+  }
+  DOMFloat64Array* float64Array = maybeShared.viewNotShared();
   if (float64Array->length() != 6 && float64Array->length() != 16) {
     exceptionState.throwTypeError(
         "The sequence must contain 6 elements for a 2D matrix or 16 elements "