Fix out-of-memory crashes related to ArrayBuffer allocation

third_party/WebKit/Source/core/dom/DOMSharedArrayBuffer.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DOMSharedArrayBuffer_h
 #define DOMSharedArrayBuffer_h
 
 #include "core/CoreExport.h"
 #include "core/dom/DOMArrayBufferBase.h"
 #include "wtf/ArrayBuffer.h"
 
 namespace blink {
 
 class CORE_EXPORT DOMSharedArrayBuffer final : public DOMArrayBufferBase {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PassRefPtr<DOMSharedArrayBuffer> create(PassRefPtr<WTF::ArrayBuffer> buffer)
+    static PassRefPtr<DOMSharedArrayBuffer> createOrNull(PassRefPtr<WTF::ArrayBuffer> buffer)
     {
+        if (!buffer)
+            return nullptr;
         ASSERT(buffer->isShared());
         return adoptRef(new DOMSharedArrayBuffer(buffer));
     }
-    static PassRefPtr<DOMSharedArrayBuffer> create(unsigned numElements, unsigned elementByteSize)
+    static PassRefPtr<DOMSharedArrayBuffer> createOrNull(unsigned numElements, unsigned elementByteSize)
     {
-        return create(WTF::ArrayBuffer::createShared(numElements, elementByteSize));
+        return createOrNull(WTF::ArrayBuffer::createSharedOrNull(numElements, elementByteSize));
     }
-    static PassRefPtr<DOMSharedArrayBuffer> create(const void* source, unsigned byteLength)
+    static PassRefPtr<DOMSharedArrayBuffer> createOrNull(const void* source, unsigned byteLength)
     {
-        return create(WTF::ArrayBuffer::createShared(source, byteLength));
+        return createOrNull(WTF::ArrayBuffer::createSharedOrNull(source, byteLength));
     }
     static PassRefPtr<DOMSharedArrayBuffer> create(WTF::ArrayBufferContents& contents)
     {
         ASSERT(contents.isShared());
-        return create(WTF::ArrayBuffer::create(contents));
+        return adoptRef(new DOMSharedArrayBuffer(WTF::ArrayBuffer::create(contents)));
     }
-
+    static PassRefPtr<DOMSharedArrayBuffer> create(PassRefPtr<WTF::ArrayBuffer> buffer)
+    {
+        ASSERT(buffer && buffer->isShared());
+        return adoptRef(new DOMSharedArrayBuffer(buffer));
+    }
     v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) override;
 
 private:
     explicit DOMSharedArrayBuffer(PassRefPtr<WTF::ArrayBuffer> buffer)
         : DOMArrayBufferBase(buffer)
     {
     }
 };
 
 } // namespace blink
 
 #endif // DOMSharedArrayBuffer_h