Update TextureViewTest to use PixelCopy

This test uses the UiAutomator framework to take a screenshot which
captures the primary display. If the activity is launched on a virtual
display then the test will fail at the pixel comparison step. Update the
test to instead use PixelCopy to capture content in the activity's window.

Bug: 65742914
Test: TextureViewTest#testFirstFrames
Change-Id: Ie1012da758933a6f66a0876d8aaa57ef78dac05b
1 file changed