WIP enum / V8PerContextData solution

Source/bindings/v8/custom/V8InjectedScriptHostCustom.cpp

Index: Source/bindings/v8/custom/V8InjectedScriptHostCustom.cpp
diff --git a/Source/bindings/v8/custom/V8InjectedScriptHostCustom.cpp b/Source/bindings/v8/custom/V8InjectedScriptHostCustom.cpp
index a4ed4ac24136c94849308c457b9bb30ba0e48c12..fd26de244be8c7a0cec4992a669add35f802de72 100644
--- a/Source/bindings/v8/custom/V8InjectedScriptHostCustom.cpp
+++ b/Source/bindings/v8/custom/V8InjectedScriptHostCustom.cpp
@@ -313,6 +313,11 @@ v8::Handle<v8::Value> V8InjectedScriptHost::evaluateMethodCustom(const v8::Argum
     if (expression.IsEmpty())
         return v8::ThrowException(v8::Exception::Error(v8::String::New("The argument must be a string.")));
 
+    // Mark the context as temporarily used by debugger.
+    v8::HandleScope scope;
+    v8::Local<v8::Context> context = v8::Context::GetCurrent();
+    V8ScopedCompilation debuggerCompilation(context, DevtoolsScriptCompilation);
+
     v8::Handle<v8::Script> script = v8::Script::Compile(expression);
     if (script.IsEmpty()) // Return immediately in case of exception to let the caller handle it.
         return v8::Handle<v8::Value>();