Polish ChromeOS options dialog:

- Add a chromeos OptionsWindowView that hosts options pages in a ChromeWindow
  so that it has a frame; This piece of code is based on Chrome's
  OptionsWindowView. Ideally, we should use Chrome's options view but
  we still missing underlying controls such as Tree and Table.
- Use last active browser window as options dialog's parent;
  This makes optiosn dialog transient for the browser window and window
  manager will no longer treat it as top-level window and will not move
  and resize it;
- If user switches to a new browser window and invokes options dialog again,
  close the existing one and re-opens it for the current browser window.
  This is currently supported by window manager;
- Update CustomerFrameView and WindowDelegate to make client edge optionaly;
  Options dialog has no client area padding and does not have a client
  edge per UI mock;
- Make NativeViewHost respects its background. This solves the problem that
  tab pane background is not properly cleared when hosting a native GtkVBox
  pane in TabbedPane;

BUG=<http://crosbug.com/1885>
TEST=Verify ChromeOS settings dialog looks like the mocks in http://www.chromium.org/chromium-os/user-experience/settings

Review URL: http://codereview.chromium.org/1672003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@45204 0039d316-1c4b-4281-b951-d872f2087c98

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