Apply script preprocessor to Web page scripts only.

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 fb7ce20fd550142279eed75d4f3377c4ed05d34c..5f7df866928c696345c4f7b67ae67b58f9432555 100644
--- a/Source/bindings/v8/custom/V8InjectedScriptHostCustom.cpp
+++ b/Source/bindings/v8/custom/V8InjectedScriptHostCustom.cpp
@@ -306,6 +306,9 @@ 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.
+    V8PerContextDebugData::SystemScope systemScope(v8::Context::GetCurrent());
+
     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>();