Refactor [FramedBrowserWindow drawWindowThemeInDirtyRect:] to use themeImagePositionForAlignment:

chrome/browser/ui/cocoa/floating_bar_backing_view.mm

 // 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 "chrome/browser/ui/cocoa/floating_bar_backing_view.h"
 
 #include "base/mac/mac_util.h"
 #import "chrome/browser/ui/cocoa/framed_browser_window.h"
 
 @implementation FloatingBarBackingView
 
 - (void)drawRect:(NSRect)rect {
   NSWindow* window = [self window];
   BOOL isMainWindow = [window isMainWindow];
 
   if (isMainWindow)
     [[NSColor windowFrameColor] set];
   else
     [[NSColor windowBackgroundColor] set];
   NSRectFill(rect);
 
-  // TODO(rohitrao): Don't assume -22 here.
   [FramedBrowserWindow drawWindowThemeInDirtyRect:rect
                                           forView:self
                                            bounds:[self bounds]
-                                           offset:NSMakePoint(0, -22)
                              forceBlackBackground:YES];
 
 }
 
 // Eat all mouse events (and do *not* pass them on to the next responder!).
 - (void)mouseDown:(NSEvent*)event {}
 - (void)rightMouseDown:(NSEvent*)event {}
 - (void)otherMouseDown:(NSEvent*)event {}
 - (void)rightMouseUp:(NSEvent*)event {}
 - (void)otherMouseUp:(NSEvent*)event {}
 - (void)mouseMoved:(NSEvent*)event {}
 - (void)mouseDragged:(NSEvent*)event {}
 - (void)rightMouseDragged:(NSEvent*)event {}
 - (void)otherMouseDragged:(NSEvent*)event {}
 
 // Eat this too, except that ...
 - (void)mouseUp:(NSEvent*)event {
   // a double-click in the blank area should try to minimize, to be consistent
   // with double-clicks on the contiguous tab strip area. (It'll fail and beep.)
   if ([event clickCount] == 2 &&
       base::mac::ShouldWindowsMiniaturizeOnDoubleClick())
     [[self window] performMiniaturize:self];
 }
 
 @end  // @implementation FloatingBarBackingView