Store line extra in layouts

StaticLayout and Dynamic layout changes the values of line bottom and
descent according to linespacing modification attributes. This loses
information of the real line descent and bottom, which causes some
utilities not to be able to draw themselves in correct positions.
Examples are cursor drawing to the empty space, BulletSpan not being
able to vertically center itself in the line, and DynamicLayout not
being able to calculate the last line height properly.

This CL stores the extra added to bottom and descent values so that it
can be used later.

Test: bit CtsTextTestCases:android.text.cts.LayoutTest
Test: bit CtsTextTestCases:android.text.cts.StaticLayoutTest
Test: bit CtsTextTestCases:android.text.cts.DynamicLayoutTest
Test: bit FrameworksCoreTests:android.text.LayoutTest
Test: bit FrameworksCoreTests:android.text.StaticLayoutTest
Test: bit FrameworksCoreTests:android.text.DynamicLayoutTest
Test: bit FrameworksCoreTests:android.text.DynamicLayoutBlocksTest

Bug: 30870806
Bug: 33138492
Bug: 25194907
Change-Id: I7a1039e71e4999c75b5f26122fe6239e3ee24868