Initial bookmark bar folder window tries harder to be on-screen....

chrome/browser/cocoa/bookmark_bar_folder_controller_unittest.mm

 // Copyright (c) 2010 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/scoped_nsobject.h"
 #import "chrome/browser/cocoa/bookmark_bar_constants.h"  // namespace bookmarks
 #import "chrome/browser/cocoa/bookmark_bar_controller.h"
@@ skipping 244 matching lines @@
   [bbfc setRealTopLeft:YES];
   NSPoint pt = [bbfc windowTopLeftForWidth:0];  // screen coords
   NSPoint buttonOriginInScreen =
       [[parentButton window]
         convertBaseToScreen:[parentButton
                               convertRectToBase:[parentButton frame]].origin];
   // Within margin
   EXPECT_LE(abs(pt.x - buttonOriginInScreen.x), 2);
   EXPECT_LE(abs(pt.y - buttonOriginInScreen.y), 2);
 
+  // Make sure we see the window shift left if it spills off the screen
+  pt = [bbfc windowTopLeftForWidth:0];
+  NSPoint shifted = [bbfc windowTopLeftForWidth:9999999];
+  EXPECT_LT(shifted.x, pt.x);
+
   // If parent is a BookmarkBarFolderController, grow right.
   scoped_nsobject<BookmarkBarFolderControllerLow> bbfc2;
   bbfc2.reset([[BookmarkBarFolderControllerLow alloc]
                 initWithParentButton:[[bbfc buttons] objectAtIndex:0]
                     parentController:bbfc.get()
                        barController:parentBarController_]);
   [bbfc2 window];
   [bbfc2 setRealTopLeft:YES];
   pt = [bbfc2 windowTopLeftForWidth:0];
   // We're now overlapping the window a bit.
@@ skipping 1083 matching lines @@
   [folder deleteBookmark:folder];
   EXPECT_FALSE([folder folderController]);
 }
 
 // TODO(jrg): draggingEntered: and draggingExited: trigger timers so
 // they are hard to test.  Factor out "fire timers" into routines
 // which can be overridden to fire immediately to make behavior
 // confirmable.
 // There is a similar problem with mouseEnteredButton: and
 // mouseExitedButton:.