Improve TextView.onMeasure() for multiline text.

Previously, measures all paragraph for deciding view width.
However, in case AT_MOST measurment, we can stop calculating measure if
the measured paragraph already exceeds the upper limit.

Bug: 64389125
Test: bit CtsWidgetTestCases:*
Test: CorePerfTest. Here is a result before and after this patch.

Before:
INSTRUMENTATION_STATUS: measure_AtMost_median=50332114
INSTRUMENTATION_STATUS: measure_Exactly_median=28276317
INSTRUMENTATION_STATUS: measure_Unspecified_median=50193036

After:
INSTRUMENTATION_STATUS: measure_AtMost_median=28475187
INSTRUMENTATION_STATUS: measure_Exactly_median=26944710
INSTRUMENTATION_STATUS: measure_Unspecified_median=50880088

Change-Id: I2a39eb39817a8f845c4fa2e174a905a2d057096e