[All-In-One] Introduce BackspaceStateMachine

third_party/WebKit/Source/core/editing/BackspaceStateMachine.h

Index: third_party/WebKit/Source/core/editing/BackspaceStateMachine.h
diff --git a/third_party/WebKit/Source/core/editing/BackspaceStateMachine.h b/third_party/WebKit/Source/core/editing/BackspaceStateMachine.h
new file mode 100644
index 0000000000000000000000000000000000000000..0a225184dfb4a5a4e4e7647bca71f29b19811f00
--- /dev/null
+++ b/third_party/WebKit/Source/core/editing/BackspaceStateMachine.h
@@ -0,0 +1,39 @@
+// 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 BackspaceStateMachine_h
+#define BackspaceStateMachine_h
+
+#include "core/CoreExport.h"
+#include "wtf/Noncopyable.h"
+#include <stdint.h>
+
+namespace blink {
+
+class CORE_EXPORT BackspaceStateMachine {
+    WTF_MAKE_NONCOPYABLE(BackspaceStateMachine);

[yosin_UTC9, 2016/03/25 10:01:05]

Oops, one more, please add |STACK_ALLOCATED();|

[Seigo Nonaka, 2016/03/25 10:26:32]

Thank you very much. I'm sorry I'm not familiar with Blink.

+public:
+    BackspaceStateMachine();
+
+    // Returns true when the state machine has stopped.
+    bool updateState(uint16_t codeUnit);
+
+    // Finalize the state machine and returns the code unit count to be deleted.
+    // If the state machine hasn't finished, this method finishes the state
+    // machine first.
+    int finalizeAndGetCodeUnitCountToBeDeleted();
+
+    // Resets the internal state to the initial state.
+    void reset();
+
+private:
+    int m_CodeUnitsToBeDeleted = 0;

[yosin_UTC9, 2016/03/25 10:01:05]

s/m_CodeUnitsToBeDeleted/m_codeUnitsToBeDeleted/

We use "camelCase" instead of "UpperCamelCase"

[Seigo Nonaka, 2016/03/25 10:26:32]

Done.

+
+    // Used for composing supplementary code point with surrogate pairs.
+    uint16_t m_TrailSurrogate = 0;

[yosin_UTC9, 2016/03/25 10:01:05]

s/m_TrailSurrogate/m_trailSurrogate/

[Seigo Nonaka, 2016/03/25 10:26:32]

Done.

+};
+
+} // namespace blink
+
+#endif