Add ICUError to handle ICU failures

third_party/WebKit/Source/platform/text/ICUError.h

+// Copyright 2016 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.
+
+#ifndef ICUError_h
+#define ICUError_h
+
+#include "platform/PlatformExport.h"
+#include "wtf/Allocator.h"
+#include "wtf/Assertions.h"
+#include <unicode/utypes.h>
+
+namespace blink {
+
+// ICUError provides the unified way to handle ICU errors in Blink.
+class PLATFORM_EXPORT ICUError {
+  STACK_ALLOCATED();
+
+ public:
+  ~ICUError() { crashIfCritical(); }
+
+  UErrorCode* operator&() { return &m_error; }
+  operator UErrorCode() const { return m_error; }
+
+  // Crash the renderer in the appropriate way if critical failure occurred.
+  void crashIfCritical();
+
+ private:
+  UErrorCode m_error = U_ZERO_ERROR;
+
+  void handleFailure();
+};
+
+inline void ICUError::crashIfCritical() {
+  if (U_FAILURE(m_error))
+    handleFailure();
+}
+
+}  // namespace blink
+
+#endif  // ICUError_h