Compare updated measured size of root view

If the size of root view is known, performMeasure will be deferred
(mViewMeasureDeferred). The measured new size mMeasuredWidth/Height
will be set in setMeasuredRootSizeFromSpec, and the measured size of
the root view (host.getMeasuredWidth/Height) is still the old one.

If the size of root view is unknown, performMeasure will be called
that also updates root view's size to mMeasuredWidth/Height. This
case is the same as original.

So when comparing the size, it should use mMeasuredWidth/Height.
Otherwise windowShouldResize may be false that misses to apply
the new size for window and surface.

Fix: 412900134
Flag: EXEMPT bugfix
Test: atest ViewRootImplTest#relayoutOnWindowSizeChange
Change-Id: I2386d85f5bf0e8f482e9c508ac6ec36dcc6a6a8d