* Rewrite internals to use EmailProvider instead of raw db access
* Minor changes to APIs as necessary (and scattered changes to follow)
* Convert unit tests and check them
No change in functionality. Just getting a test infrastructure in place
before rewriting to use new EmailProvider. Provides tests for:
* get type (raw & thumb)
* open file (raw)
* open file (thumb)
* query
* resolveAttachmentIdToContentUri
Merge commit 'aeeefedb43c40e887850654ac88270755f5631c1'
* commit 'aeeefedb43c40e887850654ac88270755f5631c1':
Thumbnail cache file should be deleted when AttachmentProvider is created.
What works:
* Unit tests, except for com.android.email.activity.setup.*
* Editing existing accounts
* Create new accounts
* Checking account settings against server
* Mail sync using accounts
* Viewing mailboxes
What breaks (in approx order of planned fixes)
* Unit tests in com.android.email.activity.setup.*
* Viewing messages
* Composing messages
* Some details of account editing
* Import of existing accounts
