Enable touch-initiated drag-drop work on Windows

content/browser/renderer_host/render_widget_host_view_win.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 CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlcrack.h>
@@ skipping 266 matching lines @@
   virtual bool GetSelectionRange(ui::Range* range) OVERRIDE;
   virtual bool SetSelectionRange(const ui::Range& range) OVERRIDE;
   virtual bool DeleteRange(const ui::Range& range) OVERRIDE;
   virtual bool GetTextFromRange(const ui::Range& range,
                                 string16* text) OVERRIDE;
   virtual void OnInputMethodChanged() OVERRIDE;
   virtual bool ChangeTextDirectionAndLayoutAlignment(
       base::i18n::TextDirection direction) OVERRIDE;
   virtual void ExtendSelectionAndDelete(size_t before, size_t after) OVERRIDE;
 
+  bool has_valid_long_press_gesture() { return has_valid_long_press_gesture_; }

[dcheng, 2013/04/15 18:07:37]

Nit: make this const.

[Hongbo Min, 2013/05/16 14:47:59]

Done.

+  void CancelLongPressGesture() { has_valid_long_press_gesture_ = false; }
+
  protected:
   friend class RenderWidgetHostView;
 
   // Should construct only via RenderWidgetHostView::CreateViewForWidget.
   //
   // The view will associate itself with the given widget.
   explicit RenderWidgetHostViewWin(RenderWidgetHost* widget);
 
   // Windows Message Handlers
   LRESULT OnCreate(CREATESTRUCT* create_struct);
@@ skipping 290 matching lines @@
   scoped_ptr<SkRegion> transparent_region_;
 
   // Are touch events currently enabled?
   bool touch_events_enabled_;
 
   scoped_ptr<ui::GestureRecognizer> gesture_recognizer_;
 
   // The OS-provided default IAccessible instance for our hwnd.
   base::win::ScopedComPtr<IAccessible> window_iaccessible_;
 
+  // True if the long press gesture is forwarded to renderer process and still
+  // in a valid status, e.g. no mouse up event happens.
+  bool has_valid_long_press_gesture_;

[dcheng, 2013/04/15 18:07:37]

Perhaps just call this "in_long_press_gesture".

[Hongbo Min, 2013/05/16 14:47:59]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewWin);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_