Add load states for stalled requests

Add load states for requests stalled waiting for a socket slot
in socket pools / socket pool groups.  This is intended to
make it easier to identify issues where something is holding
on to sockets and not releasing them, as is the case in two of the referenced bugs.  Also helpful to identify proxy issues
where the global socket pool limit is reached.

Bug=241844, 233181, 248412
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=212739

[mmenke, 2013-07-16 19:32:18]

Old CL from a while back.  Stalled on figuring out what string to use for
stalled on group limit vs socket pool limit.  Decided just one string for both,
since this is really targeted at net-internals (And just having some indication
that one problem or the other is happening).

If you think two strings are better, feedback welcome.

[eroman, 2013-07-16 21:41:02]

lgtm

https://codereview.chromium.org/19278016/diff/26001/net/socket/client_socket_...
File net/socket/client_socket_pool_base_unittest.cc (right):

https://codereview.chromium.org/19278016/diff/26001/net/socket/client_socket_...
net/socket/client_socket_pool_base_unittest.cc:1948: // Test GetLoadState in the
case there's two socket requests.
nit: there's --> there are

[mmenke, 2013-07-17 14:43:05]

https://codereview.chromium.org/19278016/diff/26001/net/socket/client_socket_...
File net/socket/client_socket_pool_base_unittest.cc (right):

https://codereview.chromium.org/19278016/diff/26001/net/socket/client_socket_...
net/socket/client_socket_pool_base_unittest.cc:1948: // Test GetLoadState in the
case there's two socket requests.
On 2013/07/16 21:41:03, eroman wrote:
> nit: there's --> there are

Done.

[mmenke, 2013-07-17 14:51:18]

[+avi]:  Please do an OWNERs review of the changes to
chrome/browser/ui/tab_contents/core_tab_helper.cc.

The new state should be pretty rare.  This is targeted at one specific type of
network bug.

[mmenke, 2013-07-19 15:08:54]

Looks like avi is now on vacation.

[+jam]:  Please do an OWNERs review of the change to
chrome/browser/ui/tab_contents/core_tab_helper.cc.  Thanks!

The new state should be pretty rare.  This is targeted at one specific type of
network bug.

[jam, 2013-07-19 20:44:15]

On 2013/07/19 15:08:54, mmenke wrote:
> Looks like avi is now on vacation.
> 
> [+jam]:  Please do an OWNERs review of the change to
> chrome/browser/ui/tab_contents/core_tab_helper.cc.  Thanks!
> 
> The new state should be pretty rare.  This is targeted at one specific type of
> network bug.

lgtm

[mmenke, 2013-07-19 20:46:25]

On 2013/07/19 20:44:15, jam wrote:
> On 2013/07/19 15:08:54, mmenke wrote:
> > Looks like avi is now on vacation.
> > 
> > [+jam]:  Please do an OWNERs review of the change to
> > chrome/browser/ui/tab_contents/core_tab_helper.cc.  Thanks!
> > 
> > The new state should be pretty rare.  This is targeted at one specific type
of
> > network bug.
> 
> lgtm

Thank you both!

[commit-bot: I haz the power, 2013-07-19 20:49:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mmenke@chromium.org/19278016/33001

[commit-bot: I haz the power, 2013-07-20 04:38:56]

Change committed as 212739