Implemented system tray UI for new account management.

ash/system/tray/tray_details_view.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/tray_details_view.h"
 
 #include "ash/system/tray/fixed_sized_scroll_view.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/system/tray/tray_constants.h"
@@ skipping 109 matching lines @@
   // Cache pointer to owner in this function scope. TrayDetailsView will be
   // deleted after called ShowDefaultView.
   SystemTrayItem* owner = owner_;
   if (footer_ && footer_->content() && footer_->content()->HasFocus())
     owner->set_restore_focus(true);
   owner->system_tray()->ShowDefaultView(BUBBLE_USE_EXISTING);
   owner->set_restore_focus(false);
 }
 
 void TrayDetailsView::Layout() {
-  if (!scroller_ || !footer_ || bounds().IsEmpty()) {
+  if (bounds().IsEmpty()) {
     views::View::Layout();
     return;
   }
 
-  scroller_->set_fixed_size(gfx::Size());
-  gfx::Size size = GetPreferredSize();
+  if (scroller_) {
+    scroller_->set_fixed_size(gfx::Size());
+    gfx::Size size = GetPreferredSize();
 
-  // Set the scroller to fill the space above the bottom row, so that the
-  // bottom row of the detailed view will always stay just above the footer.
-  gfx::Size scroller_size = scroll_content_->GetPreferredSize();
-  scroller_->set_fixed_size(gfx::Size(
-      width() + scroller_->GetScrollBarWidth(),
-      scroller_size.height() - (size.height() - height())));
+    // Set the scroller to fill the space above the bottom row, so that the
+    // bottom row of the detailed view will always stay just above the footer.
+    gfx::Size scroller_size = scroll_content_->GetPreferredSize();
+    scroller_->set_fixed_size(
+        gfx::Size(width() + scroller_->GetScrollBarWidth(),
+                  scroller_size.height() - (size.height() - height())));
+  }
 
   views::View::Layout();
-  // Always make sure the footer element is bottom aligned.
-  gfx::Rect fbounds = footer_->bounds();
-  fbounds.set_y(height() - footer_->height());
-  footer_->SetBoundsRect(fbounds);
+
+  if (footer_) {
+    // Always make sure the footer element is bottom aligned.
+    gfx::Rect fbounds = footer_->bounds();
+    fbounds.set_y(height() - footer_->height());
+    footer_->SetBoundsRect(fbounds);
+  }
 }
 
 void TrayDetailsView::OnPaintBorder(gfx::Canvas* canvas) {
   if (scroll_border_) {
     int index = GetIndexOf(scroller_);
     if (index < child_count() - 1 && child_at(index + 1) != footer_)
       scroll_border_->set_visible(true);
     else
       scroll_border_->set_visible(false);
   }
 
   views::View::OnPaintBorder(canvas);
 }
 
 }  // namespace internal
 }  // namespace ash