Add support for WebPagePopup.
Add support for WebPagePopup.

If popup_type_ is WebPopupTypePage, cretes a WebWidget with
WebPagePopup::create(), and returns it.

BUG=none
TEST=none; No behavior change at this moment.


Review URL: http://codereview.chromium.org/9592041

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@125553 0039d316-1c4b-4281-b951-d872f2087c98

ropik/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,adobe/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium