Makes the view manager notify the client of new roots correctly

Makes the view manager notify the client of new roots correctly

Prior to this patch the server would not notify the client of a new
root if the client already knew about the root. Now it always
notifies.

Here's an example of this case: two nodes, A and B with B a child of
A and A the root for the client. If B is added as a root then
previously I would not send B in OnRootsAdded. Now I do.

BUG=365012
TEST=none
R=ben@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=276803

[Ben Goodger (Google), 2014-06-11 16:41:54]

lgtm

[sky, 2014-06-11 16:50:17]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2014-06-11 16:52:29]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sky@chromium.org/323413003/1

[commit-bot: I haz the power, 2014-06-11 20:43:40]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)

[commit-bot: I haz the power, 2014-06-11 21:18:43]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-11 21:18:44]

Try jobs failed on following builders:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[sky, 2014-06-12 17:19:22]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2014-06-12 17:23:26]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sky@chromium.org/323413003/1

[commit-bot: I haz the power, 2014-06-12 21:11:57]

Change committed as 276803