bindings: Add empty checks for toV8()

Source/web/WebDevToolsFrontendImpl.cpp

Index: Source/web/WebDevToolsFrontendImpl.cpp
diff --git a/Source/web/WebDevToolsFrontendImpl.cpp b/Source/web/WebDevToolsFrontendImpl.cpp
index 8fc2573655d23514498738c2ebc1939676bac400..6a8a85d16597e40bf1bc354c84663e686d39e233 100644
--- a/Source/web/WebDevToolsFrontendImpl.cpp
+++ b/Source/web/WebDevToolsFrontendImpl.cpp
@@ -85,6 +85,7 @@ void WebDevToolsFrontendImpl::didClearWindowObject(WebLocalFrameImpl* frame)
         m_devtoolsHost = DevToolsHost::create(this, m_webFrame->frame());
         v8::Handle<v8::Object> global = scriptState->context()->Global();
         v8::Handle<v8::Value> devtoolsHostObj = toV8(m_devtoolsHost.get(), global, scriptState->isolate());
+        ASSERT(!devtoolsHostObj.IsEmpty());

[haraken, 2015/04/28 04:24:59]

Who guarantees this is not empty?

[bashi, 2015/04/28 05:41:53]

This is DevTool related code so I just guessed that this is not empty in
general. Adding yurys@ for his input.

         global->Set(v8AtomicString(isolate, "DevToolsHost"), devtoolsHostObj);
     }