Add timeouts to HttpClient.

Add timeouts to HttpClient.

This introduces a per-connection timeout, configurable by setting
HttpClient.idleTimeout.

This also introduces a per-HttpClient timeout that will close idle
connections, if there have been no active connections for 100 ms.

BUG=https://code.google.com/p/dart/issues/detail?id=4857
R=sgjesse@google.com

Committed: https://code.google.com/p/dart/source/detail?r=22920

[Søren Gjesse, 2013-05-21 08:46:02]

lgtm

https://codereview.chromium.org/15268004/diff/1/sdk/lib/io/http.dart
File sdk/lib/io/http.dart (right):

https://codereview.chromium.org/15268004/diff/1/sdk/lib/io/http.dart#newcode877
sdk/lib/io/http.dart:877: * Get and set the idle timeout of non-active
keep-alive connections. The
keep-alive -> persistent (keep-alive)

[Anders Johnsen, 2013-05-21 09:01:09]

https://codereview.chromium.org/15268004/diff/1/sdk/lib/io/http.dart
File sdk/lib/io/http.dart (right):

https://codereview.chromium.org/15268004/diff/1/sdk/lib/io/http.dart#newcode877
sdk/lib/io/http.dart:877: * Get and set the idle timeout of non-active
keep-alive connections. The
On 2013/05/21 08:46:02, Søren Gjesse wrote:
> keep-alive -> persistent (keep-alive)

Done.

[Anders Johnsen, 2013-05-21 09:01:30]

Committed patchset #2 manually as r22920 (presubmit successful).