Improve panel tests by properly waiting for expected conditions.

chrome/browser/ui/panels/panel_gtk.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 "chrome/browser/ui/panels/panel_gtk.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <X11/XF86keysym.h>
 
@@ skipping 930 matching lines @@
 }
 
 gfx::Size PanelGtk::ContentSizeFromWindowSize(
     const gfx::Size& window_size) const {
   gfx::Size& frame_size = GetFrameSize();
   return gfx::Size(window_size.width() - frame_size.width(),
                    window_size.height() - frame_size.height());
 }
 
 int PanelGtk::TitleOnlyHeight() const {
-  GtkAllocation allocation;
-  gtk_widget_get_allocation(titlebar_->widget(), &allocation);
-  return allocation.height;
+  gfx::Size& frame_size = GetFrameSize();
+  if (!frame_size.IsEmpty())
+    return frame_size.height() - kFrameBorderThickness;
+
+  NOTREACHED() << "Checking title height before window allocated";
+  return 0;
 }
 
 bool PanelGtk::IsPanelAlwaysOnTop() const {
   return always_on_top_;
 }
 
 void PanelGtk::SetPanelAlwaysOnTop(bool on_top) {
   if (always_on_top_ == on_top)
     return;
   always_on_top_ = on_top;
@@ skipping 159 matching lines @@
       break;
     case panel::RESTORE_BUTTON:
       button = titlebar->restore_button();
       break;
     default:
       NOTREACHED();
       return false;
   }
   return gtk_widget_get_visible(button->widget());
 }