Additional DCHECKs when accessing SharedArrayBuffer

third_party/WebKit/Source/wtf/typed_arrays/ArrayBuffer.h

Index: third_party/WebKit/Source/wtf/typed_arrays/ArrayBuffer.h
diff --git a/third_party/WebKit/Source/wtf/typed_arrays/ArrayBuffer.h b/third_party/WebKit/Source/wtf/typed_arrays/ArrayBuffer.h
index d3c061b41e047a5bc7d966f11e5d0186f5b58501..d9011cf552868091aa0cbec6f8fb5fee7d2a2680 100644
--- a/third_party/WebKit/Source/wtf/typed_arrays/ArrayBuffer.h
+++ b/third_party/WebKit/Source/wtf/typed_arrays/ArrayBuffer.h
@@ -63,6 +63,10 @@ class WTF_EXPORT ArrayBuffer : public RefCounted<ArrayBuffer> {
 
   inline void* data();
   inline const void* data() const;
+  inline void* dataShared();
+  inline const void* dataShared() const;
+  inline void* dataMaybeShared();
+  inline const void* dataMaybeShared() const;
   inline unsigned byteLength() const;
 
   // Creates a new ArrayBuffer object with copy of bytes in this object
@@ -140,7 +144,7 @@ PassRefPtr<ArrayBuffer> ArrayBuffer::create(const void* source,
 }
 
 PassRefPtr<ArrayBuffer> ArrayBuffer::create(ArrayBufferContents& contents) {
-  RELEASE_ASSERT(contents.data());
+  RELEASE_ASSERT(contents.dataMaybeShared());
   return adoptRef(new ArrayBuffer(contents));
 }
 
@@ -188,9 +192,9 @@ PassRefPtr<ArrayBuffer> ArrayBuffer::createShared(const void* source,
                                                   unsigned byteLength) {
   ArrayBufferContents contents(byteLength, 1, ArrayBufferContents::Shared,
                                ArrayBufferContents::DontInitialize);
-  RELEASE_ASSERT(contents.data());
+  RELEASE_ASSERT(contents.dataShared());
   RefPtr<ArrayBuffer> buffer = adoptRef(new ArrayBuffer(contents));
-  memcpy(buffer->data(), source, byteLength);
+  memcpy(buffer->dataShared(), source, byteLength);
   return buffer.release();
 }
 
@@ -200,7 +204,7 @@ PassRefPtr<ArrayBuffer> ArrayBuffer::createShared(
     ArrayBufferContents::InitializationPolicy policy) {
   ArrayBufferContents contents(numElements, elementByteSize,
                                ArrayBufferContents::Shared, policy);
-  RELEASE_ASSERT(contents.data());
+  RELEASE_ASSERT(contents.dataShared());
   return adoptRef(new ArrayBuffer(contents));
 }
 
@@ -220,6 +224,22 @@ const void* ArrayBuffer::data() const {
   return m_contents.data();
 }
 
+void* ArrayBuffer::dataShared() {
+  return m_contents.dataShared();
+}
+
+const void* ArrayBuffer::dataShared() const {
+  return m_contents.dataShared();
+}
+
+void* ArrayBuffer::dataMaybeShared() {
+  return m_contents.dataMaybeShared();
+}
+
+const void* ArrayBuffer::dataMaybeShared() const {
+  return m_contents.dataMaybeShared();
+}
+
 unsigned ArrayBuffer::byteLength() const {
   return m_contents.sizeInBytes();
 }