Blink-in-JS: Allow a stackoverflow error thrown by private scripts

Source/bindings/core/v8/PrivateScriptRunner.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "bindings/core/v8/PrivateScriptRunner.h"
 
 #include "bindings/core/v8/DOMWrapperWorld.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/V8Binding.h"
@@ skipping 236 matching lines @@
 
     String exceptionName = toCoreString(v8::Handle<v8::String>::Cast(name));
     if (exceptionName == "PrivateScriptException") {
         v8::Handle<v8::Value> code = exceptionObject->Get(v8String(isolate, "code"));
         RELEASE_ASSERT(!code.IsEmpty() && code->IsInt32());
         exceptionState.throwDOMException(toInt32(code), messageString);
         exceptionState.throwIfNeeded();
         return;
     }
 
+    // Standard JS errors thrown by a private script are treated as real errors
+    // of the private script and crash the renderer, except for a stack overflow
+    // error. A stack overflow error can happen in a valid private script
+    // if user's script can create a recursion that involves the private script.
+    if (exceptionName == "RangeError" && messageString.contains("Maximum call stack size exceeded")) {
+        exceptionState.throwDOMException(V8RangeError, messageString);
+        exceptionState.throwIfNeeded();
+        return;
+    }
+
     fprintf(stderr, "Private script error: %s was thrown.\n", exceptionName.utf8().data());
     dumpV8Message(tryCatchMessage);
     RELEASE_ASSERT_NOT_REACHED();
 }
 
 } // namespace blink