bindings: Use Maybe APIs in V8ScriptRunner (part 1)

Source/bindings/core/v8/WorkerScriptController.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 166 matching lines @@
 
     if (!m_disableEvalPending.isEmpty()) {
         m_scriptState->context()->AllowCodeGenerationFromStrings(false);
         m_scriptState->context()->SetErrorMessageForCodeGenerationFromStrings(v8String(isolate(), m_disableEvalPending));
         m_disableEvalPending = String();
     }
 
     v8::TryCatch block;
 
     v8::Handle<v8::String> scriptString = v8String(isolate(), script);
-    v8::Handle<v8::Script> compiledScript = V8ScriptRunner::compileScript(scriptString, fileName, String(), scriptStartPosition, isolate(), nullptr, nullptr, cacheHandler, SharableCrossOrigin, v8CacheOptions);
-    v8::Local<v8::Value> result = V8ScriptRunner::runCompiledScript(isolate(), compiledScript, &m_workerGlobalScope);
+    v8::Local<v8::Script> compiledScript;
+    v8::MaybeLocal<v8::Value> maybeResult;
+    if (V8ScriptRunner::compileScript(scriptString, fileName, String(), scriptStartPosition, isolate(), nullptr, nullptr, cacheHandler, SharableCrossOrigin, v8CacheOptions).ToLocal(&compiledScript))
+        maybeResult = V8ScriptRunner::runCompiledScript(isolate(), compiledScript, &m_workerGlobalScope);
 
     if (!block.CanContinue()) {
         forbidExecution();
         return ScriptValue();
     }
 
     if (block.HasCaught()) {
         v8::Local<v8::Message> message = block.Message();
         m_globalScopeExecutionState->hadException = true;
         m_globalScopeExecutionState->errorMessage = toCoreString(message->Get());
         m_globalScopeExecutionState->lineNumber = message->GetLineNumber();
         m_globalScopeExecutionState->columnNumber = message->GetStartColumn() + 1;
         TOSTRING_DEFAULT(V8StringResource<>, sourceURL, message->GetScriptOrigin().ResourceName(), ScriptValue());
         m_globalScopeExecutionState->sourceURL = sourceURL;
         m_globalScopeExecutionState->exception = ScriptValue(m_scriptState.get(), block.Exception());
         block.Reset();
     } else {
         m_globalScopeExecutionState->hadException = false;
     }
 
-    if (result.IsEmpty() || result->IsUndefined())
+    v8::Local<v8::Value> result;
+    if (!maybeResult.ToLocal(&result) || result->IsUndefined())
         return ScriptValue();
 
     return ScriptValue(m_scriptState.get(), result);
 }
 
 bool WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode, RefPtrWillBeRawPtr<ErrorEvent>* errorEvent, CachedMetadataHandler* cacheHandler, V8CacheOptions v8CacheOptions)
 {
     if (isExecutionForbidden())
         return false;
 
@@ skipping 62 matching lines @@
 
 void WorkerScriptController::rethrowExceptionFromImportedScript(PassRefPtrWillBeRawPtr<ErrorEvent> errorEvent, ExceptionState& exceptionState)
 {
     const String& errorMessage = errorEvent->message();
     if (m_globalScopeExecutionState)
         m_globalScopeExecutionState->m_errorEventFromImportedScript = errorEvent;
     exceptionState.rethrowV8Exception(V8ThrowException::createGeneralError(isolate(), errorMessage));
 }
 
 } // namespace blink