Add 'flog' service implementation.

Add 'flog' service implementation.
This is the first take on the service implementation for formatted
logging. Logs are stored to the service's app persistent storage. The
service creates loggers, enumerates existing logs and creates log
readers for apps that want to consume logs. Currently the service will
only enumerate logs that existed when the service started. There's no
support for reading logs that are currently open. I also need to add
the ability to log generic text/file/line entries.

R=kulakowski@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/f6adcd2ac60af3897b5d9b2e05dfd6a7777da11d

[dalesat, 2016-06-06 19:06:19]

Description was changed from

==========
Add 'flog' service implementation.
This is the first take on the service implementation for formatted
logging. Logs are stored to the service's app persistent storage. The
service creates loggers, enumerates existing logs and creates log
readers for apps that want to consume logs. Currently the service will
only enumerate logs that existed when the service started. There's no
support for reading logs that are currently open. I also need to add
the ability to log generic text/file/line entries.
==========

to

==========
Add 'flog' service implementation.
This is the first take on the service implementation for formatted
logging. Logs are stored to the service's app persistent storage. The
service creates loggers, enumerates existing logs and creates log
readers for apps that want to consume logs. Currently the service will
only enumerate logs that existed when the service started. There's no
support for reading logs that are currently open. I also need to add
the ability to log generic text/file/line entries.
==========

[dalesat, 2016-06-06 19:06:19]

dalesat@chromium.org changed reviewers:
+ kulakowski@chromium.org

[dalesat, 2016-06-06 19:06:30]

Please take a look. Thanks!

[kulakowski, 2016-06-13 20:14:26]

Otherwise seems ok. Still reviewing your doc.

https://codereview.chromium.org/2046703002/diff/1/services/flog/flog_directory.h
File services/flog/flog_directory.h (right):

https://codereview.chromium.org/2046703002/diff/1/services/flog/flog_director...
services/flog/flog_directory.h:22: std::function<void(std::map<uint32_t,
std::string>&&)>;
Style guide still bans rvalue refs outside the move special members.

[dalesat, 2016-06-14 16:49:57]

PTAL

[kulakowski, 2016-06-15 22:10:18]

lgtm

[dalesat, 2016-06-15 22:41:37]

Description was changed from

==========
Add 'flog' service implementation.
This is the first take on the service implementation for formatted
logging. Logs are stored to the service's app persistent storage. The
service creates loggers, enumerates existing logs and creates log
readers for apps that want to consume logs. Currently the service will
only enumerate logs that existed when the service started. There's no
support for reading logs that are currently open. I also need to add
the ability to log generic text/file/line entries.
==========

to

==========
Add 'flog' service implementation.
This is the first take on the service implementation for formatted
logging. Logs are stored to the service's app persistent storage. The
service creates loggers, enumerates existing logs and creates log
readers for apps that want to consume logs. Currently the service will
only enumerate logs that existed when the service started. There's no
support for reading logs that are currently open. I also need to add
the ability to log generic text/file/line entries.

R=kulakowski@chromium.org

Committed:
https://chromium.googlesource.com/external/mojo/+/f6adcd2ac60af3897b5d9b2e05d...
==========

[dalesat, 2016-06-15 22:41:39]

Committed patchset #2 (id:20001) manually as
f6adcd2ac60af3897b5d9b2e05dfd6a7777da11d (presubmit successful).