Revert of Avoid style clobbering in setCompositionFromExistingText.

Source/core/editing/InputMethodController.h

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 #ifndef InputMethodController_h
 #define InputMethodController_h
 
 #include "core/CoreExport.h"
-#include "core/dom/Range.h"
 #include "core/editing/CompositionUnderline.h"
 #include "core/editing/EphemeralRange.h"
 #include "core/editing/PlainTextRange.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class Editor;
 class LocalFrame;
@@ skipping 25 matching lines @@
     bool confirmComposition(const String& text);
     // Inserts the text that is being composed or specified non-empty text and
     // returns true.
     bool confirmCompositionOrInsertText(const String& text, ConfirmCompositionBehavior);
     // Deletes the existing composition text.
     void cancelComposition();
     void cancelCompositionIfSelectionIsInvalid();
     EphemeralRange compositionEphemeralRange() const;
     PassRefPtrWillBeRawPtr<Range> compositionRange() const;
 
+    // getting international text input composition state (for use by InlineTextBox)
+    Text* compositionNode() const { return m_compositionNode.get(); }
+    unsigned compositionStart() const { return m_compositionStart; }
+    unsigned compositionEnd() const { return m_compositionEnd; }
+    bool compositionUsesCustomUnderlines() const { return !m_customCompositionUnderlines.isEmpty(); }
+    const Vector<CompositionUnderline>& customCompositionUnderlines() const { return m_customCompositionUnderlines; }
+
     void clear();
 
     PlainTextRange getSelectionOffsets() const;
     // Returns true if setting selection to specified offsets, otherwise false.
     bool setEditableSelectionOffsets(const PlainTextRange&);
     void extendSelectionAndDelete(int before, int after);
 
 private:
     class SelectionOffsetsScope {
         WTF_MAKE_NONCOPYABLE(SelectionOffsetsScope);
         STACK_ALLOCATED();
     public:
         explicit SelectionOffsetsScope(InputMethodController*);
         ~SelectionOffsetsScope();
     private:
         RawPtrWillBeMember<InputMethodController> m_inputMethodController;
         const PlainTextRange m_offsets;
     };
     friend class SelectionOffsetsScope;
 
     RawPtrWillBeMember<LocalFrame> m_frame;
-    RefPtrWillBeMember<Range> m_compositionRange;
-    bool m_isDirty;
-    bool m_hasComposition;
+    RefPtrWillBeMember<Text> m_compositionNode;
+    // We don't use PlainTextRange which is immutable, for composition range.
+    unsigned m_compositionStart;
+    unsigned m_compositionEnd;
+    // startOffset and endOffset of CompositionUnderline are based on
+    // m_compositionNode.
+    Vector<CompositionUnderline> m_customCompositionUnderlines;
 
     explicit InputMethodController(LocalFrame&);
 
     Editor& editor() const;
     LocalFrame& frame() const
     {
         ASSERT(m_frame);
         return *m_frame;
     }
 
     bool insertTextForConfirmedComposition(const String& text);
     void selectComposition() const;
     enum FinishCompositionMode { ConfirmComposition, CancelComposition };
     // Returns true if composition exists.
     bool finishComposition(const String&, FinishCompositionMode);
     bool setSelectionOffsets(const PlainTextRange&);
 };
 
 } // namespace blink
 
 #endif // InputMethodController_h