Implement GetTextFromRange(), GetTextRange() and GetSelectionRange() for ArcImeService.

components/arc/ime/arc_ime_bridge.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 COMPONENTS_ARC_IME_ARC_IME_BRIDGE_H_
 #define COMPONENTS_ARC_IME_ARC_IME_BRIDGE_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "ui/base/ime/text_input_type.h"
 
 namespace gfx {
+class Range;
 class Rect;
 }  // namespace gfx
 
 namespace ui {
 struct CompositionText;
 }  // namespace ui
 
 namespace arc {
 
 // This interface class encapsulates the detail of IME related IPC between
 // Chromium and the ARC container.
 class ArcImeBridge {
  public:
   virtual ~ArcImeBridge() {}
 
   // Received IPCs are deserialized and passed to this delegate.
   class Delegate {
    public:
     virtual void OnTextInputTypeChanged(ui::TextInputType type) = 0;
     virtual void OnCursorRectChanged(const gfx::Rect& rect) = 0;
     virtual void OnCancelComposition() = 0;
     virtual void ShowImeIfNeeded() = 0;
+    virtual void OnCursorRectChangedWithSurroundingText(
+        const gfx::Rect& rect,
+        const gfx::Range& text_range,
+        const base::string16& text_in_range,
+        const gfx::Range& selection_range) = 0;
   };
 
   // Serializes and sends IME related requests through IPCs.
   virtual void SendSetCompositionText(
       const ui::CompositionText& composition) = 0;
   virtual void SendConfirmCompositionText() = 0;
   virtual void SendInsertText(const base::string16& text) = 0;
   virtual void SendOnKeyboardBoundsChanging(const gfx::Rect& new_bounds) = 0;
   virtual void SendExtendSelectionAndDelete(size_t before, size_t after) = 0;
 
  protected:
   ArcImeBridge() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ArcImeBridge);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_IME_ARC_IME_BRIDGE_H_