IDL: Add [FlexibleArrayBufferView] and use for bufferSubData

Source/bindings/core/v8/V8Binding.cpp

Index: Source/bindings/core/v8/V8Binding.cpp
diff --git a/Source/bindings/core/v8/V8Binding.cpp b/Source/bindings/core/v8/V8Binding.cpp
index 98801516839b96d5f65e0ae2df6f5e9eec9826dd..210c7797628a703a5305b473790550223314cf4f 100644
--- a/Source/bindings/core/v8/V8Binding.cpp
+++ b/Source/bindings/core/v8/V8Binding.cpp
@@ -33,6 +33,7 @@
 
 #include "bindings/core/v8/ScriptController.h"
 #include "bindings/core/v8/V8AbstractEventListener.h"
+#include "bindings/core/v8/V8ArrayBufferView.h"
 #include "bindings/core/v8/V8BindingMacros.h"
 #include "bindings/core/v8/V8Element.h"
 #include "bindings/core/v8/V8EventTarget.h"
@@ -47,6 +48,7 @@
 #include "bindings/core/v8/custom/V8CustomXPathNSResolver.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
+#include "core/dom/FlexibleArrayBufferView.h"
 #include "core/dom/NodeFilter.h"
 #include "core/dom/QualifiedName.h"
 #include "core/frame/LocalDOMWindow.h"
@@ -755,6 +757,20 @@ EventTarget* toEventTarget(v8::Isolate* isolate, v8::Handle<v8::Value> value)
     return 0;
 }
 
+void toFlexibleArrayBufferView(v8::Isolate* isolate, v8::Handle<v8::Value> value, FlexibleArrayBufferView& result, void* storage)
+{
+    if (!value->IsArrayBufferView())
+        return;
+    v8::Local<v8::ArrayBufferView> buffer = value.As<v8::ArrayBufferView>();
+    if (!storage) {
+        result.setFull(V8ArrayBufferView::toImpl(buffer));
+        return;
+    }
+    size_t length = buffer->ByteLength();
+    buffer->CopyContents(storage, length);
+    result.setSmall(storage, length);
+}
+
 v8::Local<v8::Context> toV8Context(ExecutionContext* context, DOMWrapperWorld& world)
 {
     ASSERT(context);