Re-land: NativeTextfieldViews: Show the drop cursor when dragging text

ui/gfx/render_text.h

 // Copyright (c) 2012 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 UI_GFX_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <algorithm>
 #include <cstring>
 #include <string>
@@ skipping 257 matching lines @@
   // Note that this returns the raw size of the string, which does not include
   // the margin area of text shadows.
   virtual Size GetStringSize() = 0;
 
   // Returns the common baseline of the text. The returned value is the vertical
   // offset from the top of |display_rect| to the text baseline, in pixels.
   virtual int GetBaseline() = 0;
 
   void Draw(Canvas* canvas);
 
+  // Draws a cursor at |position|.
+  void DrawCursor(Canvas* canvas, const SelectionModel& position);
+
   // Draw the selected text without a cursor or selection highlight.
   void DrawSelectedText(Canvas* canvas);
 
   // Gets the SelectionModel from a visual point in local coordinates.
   virtual SelectionModel FindCursorPosition(const Point& point) = 0;
 
   // Get the visual bounds of a cursor at |selection|. These bounds typically
   // represent a vertical line, but if |insert_mode| is true they contain the
   // bounds of the associated glyph. These bounds are in local coordinates, but
   // may be outside the visible region if the text is longer than the textfield.
@@ skipping 154 matching lines @@
   // it is a NO-OP.
   void MoveCursorTo(size_t position, bool select);
 
   // Updates |obscured_text_| if the text is obscured.
   void UpdateObscuredText();
 
   // Update the cached bounds and display offset to ensure that the current
   // cursor is within the visible display area.
   void UpdateCachedBoundsAndOffset();
 
-  // Draw the selection and cursor.
+  // Draw the selection.
   void DrawSelection(Canvas* canvas);
-  void DrawCursor(Canvas* canvas);
 
   // Logical UTF-16 string data to be drawn.
   string16 text_;
 
   // Horizontal alignment of the text with respect to |display_rect_|.
   HorizontalAlignment horizontal_alignment_;
 
   // The text directionality mode, defaults to DIRECTIONALITY_FROM_TEXT.
   DirectionalityMode directionality_mode_;
 
@@ skipping 78 matching lines @@
 
   // Text shadows to be drawn.
   ShadowValues text_shadows_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_