bindings: Adds ASSERTs to check the creation context passed to public APIs.

Source/web/WebArrayBufferConverter.cpp

Index: Source/web/WebArrayBufferConverter.cpp
diff --git a/Source/web/WebArrayBufferConverter.cpp b/Source/web/WebArrayBufferConverter.cpp
index 4044b7d70bf8dedcba07d137c2cb0461167e5d89..34e5799608557874461faae892c15db49d16d3d8 100644
--- a/Source/web/WebArrayBufferConverter.cpp
+++ b/Source/web/WebArrayBufferConverter.cpp
@@ -35,10 +35,11 @@
 
 namespace blink {
 
-v8::Local<v8::Value> WebArrayBufferConverter::toV8Value(WebArrayBuffer* buffer, v8::Local<v8::Object> /* creationContext */, v8::Isolate* isolate)
+v8::Local<v8::Value> WebArrayBufferConverter::toV8Value(WebArrayBuffer* buffer, v8::Local<v8::Object> creationContext, v8::Isolate* isolate)
 {
     // We no longer use |creationContext| because it's often misused and points
     // to a context faked by user script.
+    ASSERT(creationContext->CreationContext() == isolate->GetCurrentContext());
     if (!buffer)
         return v8::Local<v8::Value>();
     return toV8(PassRefPtr<DOMArrayBuffer>(*buffer), isolate->GetCurrentContext()->Global(), isolate);