Fix long screenshot to only trigger when available

Only show the scroll chip when response.isConnected()

Previously the client only returned a response if
available. It's now returned in any case with more
information available in the negative case.

Bug: 183107714
Test: Open non-scrollable activity, take screenshot
Change-Id: I1258510d6fabab845e68f04861bb0f2b190069c7
1 file changed