Show a label to describe some invalid drag-drop operations in Files app.
1. If the destination (volume or folder) is in a write-protected external storage, "Device is write-protected".
2. If the destination is in an external storage device and writing access to there is restricted, "Access restricted".
3. Otherwise, no message.
TEST=manual test
BUG=
655003
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
Committed:
https://crrev.com/39b15cae8da27648a916ef320c4e0eb2e6ca7637
Cr-Commit-Position: refs/heads/master@{#435239}