Add MiddleClickAutoscroll cursors back on X11

ui/base/cursor/cursor_loader_x11.cc

 // 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.
 
 #include "ui/base/cursor/cursor_loader_x11.h"
 
 #include <float.h>
 #include <X11/cursorfont.h>
 #include <X11/Xlib.h>
 
@@ skipping 10 matching lines @@
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/skbitmap_operations.h"
 #include "ui/gfx/skia_util.h"
 
 namespace {
 
 // Returns CSS cursor name from an Aura cursor ID.
 const char* CursorCssNameFromId(int id) {
   switch (id) {
     case ui::kCursorMiddlePanning:
+      return "all-scroll";
     case ui::kCursorEastPanning:
+      return "e-resize";
     case ui::kCursorNorthPanning:
+      return "n-resize";
     case ui::kCursorNorthEastPanning:
+      return "ne-resize";
     case ui::kCursorNorthWestPanning:
+      return "nw-resize";
     case ui::kCursorSouthPanning:
+      return "s-resize";
     case ui::kCursorSouthEastPanning:
+      return "se-resize";
     case ui::kCursorSouthWestPanning:
+      return "sw-resize";
     case ui::kCursorWestPanning:
-      NOTREACHED() << "There's no middle-click panning on Linux or ChromeOS";
-      return "left_ptr";
+      return "w-resize";
     case ui::kCursorNone:
       return "none";
     case ui::kCursorGrab:
       return "grab";
     case ui::kCursorGrabbing:
       return "grabbing";
 
 #if defined(OS_CHROMEOS)
     case ui::kCursorNull:
     case ui::kCursorPointer:
@@ skipping 291 matching lines @@
   }
 
   // As a last resort, return a left pointer.
   cursor = XCreateFontCursor(display_, XC_left_ptr);
   DCHECK(cursor);
   font_cursors_[id] = cursor;
   return cursor;
 }
 
 }  // namespace ui