Add two small features to the HttpCache for benchmarking/debugging....

Add two small features to the HttpCache for benchmarking/debugging.

The first exposes a method to close all idle sockets.  This allows
me to create benchmark tests in the app which can close
connections before starting the test for better simulations.

The second change is to expose cache modes for cache
disabled and cache bypassed.  DISABLE sets the LOAD_DISABLE_CACHE
on every request; BYPASS sets the LOAD_BYPASS_CACHE on 
every request.

TEST=http_cache_unittest.cc
BUG=6754
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=17720

[rvargas (doing something else), 2009-06-04 21:08:20]

Looks good. Just a couple of comments. (and there are some lint warnings).

http://codereview.chromium.org/119189/diff/12/13
File net/http/http_cache.cc (right):

http://codereview.chromium.org/119189/diff/12/13#newcode1176
Line 1176: if (mode_ != RECORD && mode_ != PLAYBACK) {
Can we just DCHECK(mode_ != DISABLE) here? Does it make sense to call this
method when the cache is disabled?

http://codereview.chromium.org/119189/diff/12/14
File net/http/http_cache.h (right):

http://codereview.chromium.org/119189/diff/12/14#newcode25
Line 25: #include "net/http/http_network_layer.h"
nit: I don't think we need to add this line, do we?

[Mike Belshe, 2009-06-05 00:58:47]

nits submitted.