Cherry-pick: Scale the layout width by the UA initial scale

Cherry-pick of chromium http://crrev.com/59073007

Bug: 10528370

Original description:

[Android WebView] Scale the layout width by the UA initial scale

Another subtle difference of the Classic WebView implementation. In non-wide
viewport mode, the UA initial scale (set via 'setInitialPageScaleOverride')
can stretch the resulting layout width.

BUG=315552

Change-Id: I1292a7cde36c86e8513758dd5e67e71a524c4f0f
1 file changed