[Quantum chips] change chips into ReplacementSpan

There seems to be an issue with ImageSpan where it
sets the default text cursor size to the height of
the ImageSpan. In this CL I changed the chips to
extend ReplacementSpan and simply draw the chip
ourselves by overriding the draw method.

b/16700424

Change-Id: I66a8bf3068e24a669121c7323323fd03138ca7b3
6 files changed
tree: 3ba7457a730cb2f2ac9311d8425b194af050dc50
  1. res/
  2. sample/
  3. src/
  4. tests/
  5. Android.mk
  6. AndroidManifest.xml
  7. project.properties