Attach the title bar to the top of the page.

Remove the old notions of changing the viewing mode
resulting in changing the visibility of the title bar.
Instead, attach the title bar to the top of the page.
Change contentToView() to contentToViewY() (and an X
version; same change for viewToContent), to account
for the title bar's height.  Adjust the parameters
for drawing the scroll bar to account for the title bar.
Requires a change to packages/apps/Browser.

Change-Id: Ic0f7d6e0a1cce58ba2bca87337cf72a8194e9aa4