Add support for a .gclient_ignore which tells gclient to ignore versioning of...

Add support for a .gclient_ignore which tells gclient to ignore versioning of a directory on a sync.

Behavior is exactly like having a .git file except that it won't interfere with git functionality.  An example where this comes up is if you have all of WebKit checked out in a git repository, and swap out src/third_party/WebKit to point to the git version.  Since some of the subdirectories under WebKit (eg., src/third_party/WebKit/JavaScriptCore) are specified as separate dependencies, gclient will attempt to update them, but they won't have a .git directory .

[M-A Ruel, 2009-06-06 01:01:36]

You should use custom_deps instead ??

[awong, 2009-06-09 18:01:12]

On 2009/06/06 01:01:36, Marc-Antoine Ruel wrote:
> You should use custom_deps instead ??

So, adding a "some_directory": None into the custom_deps isn't supposed to
delete the directory tree then?

Is this a bug you're working on, or should I take a stab at it?

Thanks,
Albert

[awong, 2009-06-15 20:59:39]

On 2009/06/09 18:01:12, awong wrote:
> On 2009/06/06 01:01:36, Marc-Antoine Ruel wrote:
> > You should use custom_deps instead ??
> 
> So, adding a "some_directory": None into the custom_deps isn't supposed to
> delete the directory tree then?
> 
> Is this a bug you're working on, or should I take a stab at it?
> 
> Thanks,
> Albert

Closing in favor of a different fix.
http://codereview.chromium.org/125147