Fix grabbing capture when the mouse is pressed on Desktop Linux.

ui/views/widget/desktop_aura/x11_move_loop.h

 // Copyright 2014 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_VIEWS_WIDGET_DESKTOP_AURA_X11_MOVE_LOOP_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_MOVE_LOOP_H_
 
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/x/x11_types.h"
 
 namespace views {
 
 // Runs a nested message loop and grabs the mouse. This is used to implement
 // dragging.
 class X11MoveLoop {
  public:
   virtual ~X11MoveLoop() {}
 
-  // Runs the nested message loop. While the mouse is grabbed, use |cursor| as
-  // the mouse cursor. Returns true if the move-loop is completed successfully.
-  // If the pointer-grab fails, or the move-loop is canceled by the user (e.g.
-  // by pressing escape), then returns false.
-  virtual bool RunMoveLoop(aura::Window* window, gfx::NativeCursor cursor) = 0;
+  // Runs the nested message loop. Returns true if the move-loop is completed
+  // successfully. If the pointer-grab fails, or the move-loop is canceled by
+  // the user (e.g. by pressing escape), then returns false.
+  virtual bool RunMoveLoop(aura::Window* window) = 0;

[sadrul, 2014/12/22 21:46:36]

Would it be possible to split this part of the change into a separate CL?

 
   // Updates the cursor while the move loop is running.
   virtual void UpdateCursor(gfx::NativeCursor cursor) = 0;
 
   // Ends the move loop that's currently in progress.
   virtual void EndMoveLoop() = 0;
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_MOVE_LOOP_H_