ash: A number of ui/ux changes from feedback/to better match the mocks.

ash/system/tray/system_tray.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 "ash/system/tray/system_tray.h"
 
 #include "ash/shell.h"
 #include "ash/shell/panel_window.h"
 #include "ash/shell_window_ids.h"
+#include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/system/user/login_status.h"
 #include "ash/wm/shadow_types.h"
 #include "ash/wm/window_animations.h"
 #include "base/logging.h"
 #include "base/timer.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 271 matching lines @@
       audio_controller_(NULL),
       brightness_controller_(NULL),
       date_format_observer_(NULL),
       network_controller_(NULL),
       power_status_controller_(NULL),
       update_controller_(NULL),
       bubble_(NULL),
       popup_(NULL) {
   container_ = new views::View;
   container_->SetLayoutManager(new views::BoxLayout(
-      views::BoxLayout::kHorizontal, 5, 0, 3));
+      views::BoxLayout::kHorizontal, 5, 0, kTrayPaddingBetweenItems));
   container_->set_background(new SystemTrayBackground);
   set_border(views::Border::CreateEmptyBorder(0, 0,
         kPaddingFromBottomOfScreen, kPaddingFromRightEdgeOfScreen));
   set_notify_enter_exit_on_child(true);
   set_focusable(true);
   SetLayoutManager(new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));
   AddChildView(container_);
 }
 
 SystemTray::~SystemTray() {
@@ skipping 126 matching lines @@
   SchedulePaint();
 }
 
 void SystemTray::OnWidgetClosing(views::Widget* widget) {
   CHECK_EQ(popup_, widget);
   popup_ = NULL;
   bubble_ = NULL;
 }
 
 }  // namespace ash