Added flag to allow desktop builds to experimentally turn
on support for the viewport meta tag. The --enable-viewport
flag now turns on only support for @viewport.
--enable-viewport-meta turns on viewport meta and @viewport
support.
On Android, the viewport gets rescaled when the view is
resized, i.e. phone is rotated between landscape and
portrait. On desktop, enabling the viewport causes the page
to zoom out when the window is shrunk, rather than adding
scrollbars. To support viewport on both devices, I've added
a --main-frame-resizes-are-orientation-changes flag that should be set on
Android and not desktop. This prevents the viewport scaling
code in WebViewImpl::resize().
Enabling viewport on desktop means the page scale can
change. This causes a known issue with scrollbars where
mouse events are scaled with the page, making mouse
interaction with scrollbars broken.
This is the Chromium side of a 2-side patch
(Blink-side at https://codereview.chromium.org/40423003/)
BUG=232102
Review URL: https://codereview.chromium.org/38793007
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234617 0039d316-1c4b-4281-b951-d872f2087c98
a41f8f60ba