Do not crash when out of memory at ImageData::create().

Source/core/dom/DOMTypedArray.h

Index: Source/core/dom/DOMTypedArray.h
diff --git a/Source/core/dom/DOMTypedArray.h b/Source/core/dom/DOMTypedArray.h
index 8b14ac0d41a56fbc76342c05cec6cb6aff4b946c..e8ea244f2d0bf12225cd317cbcf36dd025915ecb 100644
--- a/Source/core/dom/DOMTypedArray.h
+++ b/Source/core/dom/DOMTypedArray.h
@@ -52,6 +52,12 @@ public:
         return adoptRef(new ThisType(bufferView.release(), buffer.release()));
     }
 
+    static PassRefPtr<ThisType> createOrNull(unsigned length)
+    {
+        RefPtr<WTF::ArrayBuffer> buffer = WTF::ArrayBuffer::createOrNull(length, 1);
+        return buffer ? create(buffer.release(), 0, length) : nullptr;
+    }
+
     const WTFTypedArray* view() const { return static_cast<const WTFTypedArray*>(DOMArrayBufferView::view()); }
     WTFTypedArray* view() { return static_cast<WTFTypedArray*>(DOMArrayBufferView::view()); }