Add documentation for git-map-branches, git-map, git-nav-downstream,

docs/src/git-map.txt

+git-map(1)
+==========
+
+NAME
+----
+git-map -
+include::_git-map_desc.helper.txt[]
+
+SYNOPSIS
+--------
+[verse]
+'git map' [<extra_args>...]
+
+DESCRIPTION
+-----------
+
+Git map formats the output of `git log --graph` from all refs such that:
+
+* Current branch is [aqua]#cyan#.
+* Local branches are [green]#green#.
+* Remote branches are [red]#red#.
+* Tags are [fuchsia]#magenta#.
+* The currently checked out commit is highlighted with a [yellow blue-background]#blue background#.
+
+The output is automatically piped through the `less` pager command, even on
+windows.
+
+OPTIONS
+-------
+<extra_args>...::
+        Extra parameters to pass to the internal linkgit:git-log[1] invocation. This
+        can be used to restrict what refs 'git map' operates on, etc.
++
+If you run git map with a series of fixed arguments frequently, you can use
+the depot_tools.map_extra configuration variable to pre-set arguments (See
+`CONFIGURATION VARIABLES`)
+
+
+CONFIGURATION VARIABLES
+-----------------------
+
+depot_tools.map_extra
+~~~~~~~~~~~~~~~~~~~~~
+
+Each value of the 'depot_tools.map_extra' config variable is applied as an
+additional argument to `git log` during the execution of git map. If you wish to
+configure this, use git `config --add depot_tools.map_extra <value>` to do so.
+
+EXAMPLE
+-------
+
+Running 'git map' would result in an output something like:
+
+[subs="quotes,attributes"]
+----
+[white]**$ git map**
+[white blue-background]##*##{zwsp}[blue-background red]** 7dcfe47       ** [green]##(##{zwsp}[aqua]**frozen_changes**{zwsp}[green]##)## [yellow]##2014-03-12## \~ FREEZE.unindexed
+* [red]**4b0c180**        [yellow]##2014-03-12## \~ modfile
+* [red]**59a7cca**        [yellow]##2014-03-12## \~ a deleted file
+* [red]**6bec695**        [green]##(##{zwsp}[red]##origin/master##{zwsp}[green]##)## [yellow]##2014-03-11## \~ Add neat feature
+* [red]**d15a38a**        [yellow]##2014-03-11## \~ Epic README update
+* [red]**d559894**        [green]##(##{zwsp}[lime]**master**{zwsp}[green]##)## [yellow]##2014-03-11## \~ Important upstream change
+[red]##|## * [red]**9c311fd**      [green]##(##{zwsp}[lime]**cool_feature**{zwsp}[green]##)## [yellow]##2014-03-11## \~ Respond to CL comments
+[red]##|## [green]##|## * [red]**2a1eeb2**    [green]##(##{zwsp}[lime]**subfeature**{zwsp}[green]##)## [yellow]##2014-03-11## \~ integrate with CoolService
+[red]##|## [green]##|## * [red]**d777af6**    [yellow]##2014-03-11## \~ slick commenting action
+[red]##|## [green]##|/##
+[red]##|## * [red]**265803a**      [yellow]##2014-03-11## \~ another improvement
+[red]##|## * [red]**6d831ac**      [green]##(##{zwsp}[fuchsia]**spleen_tag**{zwsp}[green]##)## [yellow]##2014-03-11## \~ Refactor spleen
+[red]##|## * [red]**82e74ab**      [yellow]##2014-03-11## \~ Add widget
+[red]##|/##
+* [red]**d08c5b3**        [green]##(##{zwsp}[lime]**bogus_noparent**{zwsp}[green]##)## [yellow]##2014-03-11## ~ Wonderful beginnings
+----
+
+As you can see, the structure of the commit history is visible, particularly
+what the parents of each commit are.  In order to see the 'upstream'
+relationships of the branches (i.e. which branch is tracking which other
+branch), use the linkgit:git-map-branches[1] command.
+
+SEE ALSO
+--------
+linkgit:git-map-branches[1]
+
+include::_footer.txt[]
+
+// vim: ft=asciidoc noexpandtab: