Update textwrap scale when content width changes in overview mode.
Update textwrap scale when content width changes in overview mode.

This is mostly for sites which will change content width when first
loaded such as nytimes.com.

Also zoom to reading level if the zoom overview scale has very
little diff from current actual scale.

issue: 3003933
Change-Id: Ie4b32bf6ac109eef145cd59b31f04077226b9052

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base