Zero-sized windows are bad.

chrome/browser/ui/cocoa/page_info_bubble_controller.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.
 
 #import "chrome/browser/ui/cocoa/page_info_bubble_controller.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
@@ skipping 165 matching lines @@
 @implementation PageInfoBubbleController
 
 @synthesize certID = certID_;
 
 - (id)initWithPageInfoModel:(PageInfoModel*)model
               modelObserver:(PageInfoModelObserver*)bridge
                parentWindow:(NSWindow*)parentWindow {
   DCHECK(parentWindow);
 
   // Use an arbitrary height because it will be changed by the bridge.
-  NSRect contentRect = NSMakeRect(0, 0, kWindowWidth, 0);
+  NSRect contentRect = NSMakeRect(0, 0, kWindowWidth, 1);
   // Create an empty window into which content is placed.
   scoped_nsobject<InfoBubbleWindow> window(
       [[InfoBubbleWindow alloc] initWithContentRect:contentRect
                                           styleMask:NSBorderlessWindowMask
                                             backing:NSBackingStoreBuffered
                                               defer:NO]);
 
   if ((self = [super initWithWindow:window.get()
                        parentWindow:parentWindow
                          anchoredAt:NSZeroPoint])) {
@@ skipping 278 matching lines @@
     LocationBarViewMac* locationBar = [controller locationBarBridge];
     if (locationBar) {
       NSPoint bubblePoint = locationBar->GetPageInfoBubblePoint();
       origin = [parent convertBaseToScreen:bubblePoint];
     }
   }
   return origin;
 }
 
 @end