[Android] Hide active text handle.

We want to hide the active text handle when the HandleObserver is
activated.

We only want to make the handle invisible but still keep it functioning.
So in this CL we are setting its alpha to control the visibility.

Bug: 798017, 814868
Change-Id: I1d3018ab6a40307eae67c5f0146e84c0c297bcf3
Reviewed-on: https://chromium-review.googlesource.com/1011552
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Reviewed-by: Pedro Amaral <amaralp@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Shimi Zhang <ctzsm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552196}

CrOS-Libchrome-Original-Commit: fa804f3f8ebab0c246eef37a4f238b810ea70fcf
3 files changed
tree: a95a9950105827107586979fb44f8f875efd3e2a
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/