Focusing a native button through a RequestFocus call would not result in the actual button showing as focused.
This is because the NativeButton is the one getting focused not the NativeControl wrapper.
This CL adds forwarding the focus to the NativeControl so the HWND really gets focused.
It also associates the NativeButton view with the NativeControl, so that when the HWND is focused (through a click for example), the focus manager has the NativeButton as the focused view (not the NativeControl wrapper).

BUG=9253
TEST=Open the option panel. Press tab several times. The focus should move as expected to the different buttons and views in the page.
Review URL: http://codereview.chromium.org/45042

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12420 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/views/controls/button/native_button_win.h b/chrome/views/controls/button/native_button_win.h
index 501ae0dc..4bb0065 100644
--- a/chrome/views/controls/button/native_button_win.h
+++ b/chrome/views/controls/button/native_button_win.h
@@ -22,6 +22,7 @@
   virtual void UpdateFont();
   virtual void UpdateDefault();
   virtual View* GetView();
+  virtual void SetFocus();
 
   // Overridden from View:
   virtual gfx::Size GetPreferredSize();
@@ -61,6 +62,7 @@
   virtual void SetPushed(bool pushed);
 
   // Overridden from NativeControlWin:
+  virtual void SetFocus();
   virtual LRESULT ProcessMessage(UINT message,
                                  WPARAM w_param,
                                  LPARAM l_param);