commit 78ce51eacb3c0da4ea8fe88541d040a85b1bb9e6
author Ta-wei Yen <twyen@google.com> Thu Nov 30 14:46:15 2017 -0800
committer Ta-wei Yen <twyen@google.com> Thu Nov 30 14:54:46 2017 -0800
tree 94c34239184320084ab64edbac8da7077636facb
parent 29dc99f9e89e49c6e7e9ecc2cdd935ab719d6cb5

Implement DIRTY_RETAIN constant

Previously the DIRTY flag can only be automatically or explicitly set.
There are no option to express "This operation does not change the DIRTY
flag". This causes issue when the voicemail source is downloading
changes from the server instead of uploading and would clobber the flag.

After this CL, if DIRTY is updated with DIRTY_RETAIN, the flag will not
be updated for the operation.

Change-Id: I23a23a11f7d2177d10b65bbc33875b7eb838f7c1
Fixes: 64371667
Test: CtsProviderTestCases#VoicemailContractTest