Add the c++ code part of bindings2/

sky/engine/bindings2/exception_state.h

Index: sky/engine/bindings2/exception_state.h
diff --git a/sky/engine/bindings2/exception_state.h b/sky/engine/bindings2/exception_state.h
new file mode 100644
index 0000000000000000000000000000000000000000..e73b88a6fe501d6aa8c8591fb2b8da6e9bef1f75
--- /dev/null
+++ b/sky/engine/bindings2/exception_state.h
@@ -0,0 +1,68 @@
+// 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.
+
+#ifndef SKY_ENGINE_BINDINGS2_EXCEPTION_STATE_H_
+#define SKY_ENGINE_BINDINGS2_EXCEPTION_STATE_H_
+
+#include "sky/engine/tonic/dart_persistent_value.h"
+#include "sky/engine/wtf/Noncopyable.h"
+#include "sky/engine/wtf/text/WTFString.h"
+
+namespace blink {
+
+typedef int ExceptionCode;
+
+class ExceptionState {
+  WTF_MAKE_NONCOPYABLE(ExceptionState);
+
+ public:
+  enum Context {
+    ConstructionContext,
+    ExecutionContext,
+    DeletionContext,
+    GetterContext,
+    SetterContext,
+    EnumerationContext,
+    QueryContext,
+    IndexedGetterContext,
+    IndexedSetterContext,
+    IndexedDeletionContext,
+    UnknownContext,  // FIXME: Remove this once we've flipped over to the new
+                     // API.
+  };
+
+  ExceptionState();
+  ExceptionState(Context context, const char* interfaceName);
+  ExceptionState(Context context,
+                 const char* propertyName,
+                 const char* interfaceName);
+  ~ExceptionState();
+
+  void ThrowDOMException(const ExceptionCode& code, const String& message);
+  void ThrowTypeError(const String& message);
+  void ThrowRangeError(const String& message);
+
+  bool ThrowIfNeeded();
+  void ClearException();
+
+  ExceptionCode code() const { return code_; }
+  const String& message() const { return message_; }
+  bool had_exception() const { return had_exception_ || code_; }
+
+  Dart_Handle GetDartException(Dart_NativeArguments args, bool auto_scope);
+
+ private:
+  ExceptionCode code_;
+  String message_;
+  bool had_exception_;
+  DartPersistentValue exception_;
+};
+
+class NonThrowableExceptionState final : public ExceptionState {};
+
+class TrackExceptionState final : public ExceptionState {};
+
+}  // namespace blink
+
+#endif  // SKY_ENGINE_BINDINGS2_EXCEPTION_STATE_H_