Zero-sized windows are bad.

chrome/browser/ui/cocoa/status_bubble_mac.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/status_bubble_mac.h"
 
 #include <limits>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/mac/mac_util.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #import "chrome/browser/ui/cocoa/bubble_view.h"
 #include "net/base/net_util.h"
 #import "third_party/GTM/AppKit/GTMNSAnimation+Duration.h"
 #import "third_party/GTM/AppKit/GTMNSBezierPath+RoundRect.h"
 #import "third_party/GTM/AppKit/GTMNSColor+Luminance.h"
+#include "ui/base/cocoa/window_size_constants.h"
 #include "ui/base/text/text_elider.h"
 #include "ui/gfx/point.h"
 
 namespace {
 
 const int kWindowHeight = 18;
 
 // The width of the bubble in relation to the width of the parent window.
 const CGFloat kWindowWidthPercent = 1.0 / 3.0;
 
@@ skipping 321 matching lines @@
     SetFrameAvoidingMouse([window_ frame], location);
 }
 
 void StatusBubbleMac::UpdateDownloadShelfVisibility(bool visible) {
   UpdateSizeAndPosition();
 }
 
 void StatusBubbleMac::Create() {
   DCHECK(!window_);
 
-  window_ = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 1, 1)
+  window_ = [[NSWindow alloc] initWithContentRect:ui::kWindowSizeDeterminedLater
                                         styleMask:NSBorderlessWindowMask
                                           backing:NSBackingStoreBuffered
                                             defer:YES];
   [window_ setMovableByWindowBackground:NO];
   [window_ setBackgroundColor:[NSColor clearColor]];
   [window_ setLevel:NSNormalWindowLevel];
   [window_ setOpaque:NO];
   [window_ setHasShadow:NO];
 
   // We do not need to worry about the bubble outliving |parent_| because our
@@ skipping 356 matching lines @@
     }
 
     // Round the top corners when the bubble is below the parent window.
     if (NSMinY(window_frame) < NSMinY(parent_frame)) {
       corner_flags |= kRoundedTopLeftCorner | kRoundedTopRightCorner;
     }
   }
 
   return corner_flags;
 }