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

Source/web/WebBlob.cpp

Index: Source/web/WebBlob.cpp
diff --git a/Source/web/WebBlob.cpp b/Source/web/WebBlob.cpp
index 23727d425acbcbaf411e484e9acfefadc7d5231b..8adccc2ee964ea066cd8d1d73b1e82855884fed2 100644
--- a/Source/web/WebBlob.cpp
+++ b/Source/web/WebBlob.cpp
@@ -79,10 +79,11 @@ WebString WebBlob::uuid()
     return m_private->uuid();
 }
 
-v8::Local<v8::Value> WebBlob::toV8Value(v8::Local<v8::Object> /* creationContext */, v8::Isolate* isolate)
+v8::Local<v8::Value> WebBlob::toV8Value(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 (!m_private.get())
         return v8::Local<v8::Value>();
     return toV8(m_private.get(), isolate->GetCurrentContext()->Global(), isolate);