Updated the redeem URL in Files app.

This patch updates the redeem url to be able to detect redeeming initiated from the Files app.

TEST=Tested manually. Redeeming should work as before.
BUG=304808

Review URL: https://codereview.chromium.org/26640006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227739 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227739
Fix bug in calculating minimize button position

When DWM is enabled it appears that WM_GETTITLEBARINFOEX returns
values in terms of the classic theme and only returns the right thing
after an activate. This is problematic for tab dragging code as it
needs to know the size of the tabstrip before the window has shown.

The fix is to cache the offset and use the cached value until we get
the activate.

BUG=293698
TEST=none
R=ananta@chromium.org

Review URL: https://codereview.chromium.org/26518005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227740 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227740