Fix issue when launching Camera

Imagine the following: HostPhotoActivity is above CameraActivity,
in the same task, and not visible. Now, we launch the Camera again
with STILL_IMAGE_CAPTURE, which launches a Trampoline activity
in the same task, which later starts CameraActivity with
CLEAR_TASK. However, in the meantime, since Trampoline activity is
translucent (r.fullscreen == false), we make HostPhotoActivity
visible. Now, since we bring the task to the front, we also create
a snapshot starting window, for which mViewVisibility == VISIBLE
always.

When the previous activity has finished pausing we make
HostPhotoActivity's starting window visible because of the
following:
- TrampolineActivity is on top of HostPhotoActivity, but in AM
sense it's "translucent",
- TrampolineActivity hasn't managed to start CameraActivity
yet.
- HostPhotoActivity.hasContentToDisplay returns true so when
we set the Dummy animation we set the transformation.alpha=1,
making the starting window visible.

We also need to fix a that HostPhotoActivity's starting window
can't affect SystemUI visibiltiy yet.

Test: Above flow
Test: go/wm-smoke
Change-Id: I4a62aaafab4d40e975bc86b53abd0c55c84911c2
Fixes: 64270512

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