https://codereview.chromium.org/1971853002

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7b34e529fc6e5b705be1dfb6df2ab854d169b899

commit 7b34e529fc6e5b705be1dfb6df2ab854d169b899
Author: pauljensen <pauljensen@chromium.org>
Date: Thu May 12 18:20:59 2016

Move IOThread::LoggingNetworkChangeObserver to net/base

Other targets would like to use this besides Chrome.
So move it to net/base so targets like Cronet can use it.

BUG= 610293 

Review-Url: https://codereview.chromium.org/1971853002
Cr-Commit-Position: refs/heads/master@{#393305}

[modify] https://crrev.com/7b34e529fc6e5b705be1dfb6df2ab854d169b899/chrome/browser/io_thread.cc
[modify] https://crrev.com/7b34e529fc6e5b705be1dfb6df2ab854d169b899/chrome/browser/io_thread.h
[add] https://crrev.com/7b34e529fc6e5b705be1dfb6df2ab854d169b899/net/base/logging_network_change_observer.cc
[add] https://crrev.com/7b34e529fc6e5b705be1dfb6df2ab854d169b899/net/base/logging_network_change_observer.h
[modify] https://crrev.com/7b34e529fc6e5b705be1dfb6df2ab854d169b899/net/net.gypi

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/39a25a0c1fa4a6fd24ed3898e3231caa298a2e33

commit 39a25a0c1fa4a6fd24ed3898e3231caa298a2e33
Author: pauljensen <pauljensen@chromium.org>
Date: Sat May 21 02:04:42 2016

[Cronet] Add network change events to Cronet's NetLog

These NetLog events are quite useful for debugging.

BUG= 610293 
R=xunjieli

Review-Url: https://codereview.chromium.org/1977543002
Cr-Commit-Position: refs/heads/master@{#395231}

[modify] https://crrev.com/39a25a0c1fa4a6fd24ed3898e3231caa298a2e33/components/cronet/android/cronet_url_request_context_adapter.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c8450e9104c000efa1f7cb20d34e13bf08774b54

commit c8450e9104c000efa1f7cb20d34e13bf08774b54
Author: pauljensen <pauljensen@chromium.org>
Date: Tue May 24 02:49:23 2016

Make LoggingNetworkChangeObserver log specific network changes

BUG= 610293 

Review-Url: https://codereview.chromium.org/1973743004
Cr-Commit-Position: refs/heads/master@{#395520}

[modify] https://crrev.com/c8450e9104c000efa1f7cb20d34e13bf08774b54/net/base/logging_network_change_observer.cc
[modify] https://crrev.com/c8450e9104c000efa1f7cb20d34e13bf08774b54/net/base/logging_network_change_observer.h
[modify] https://crrev.com/c8450e9104c000efa1f7cb20d34e13bf08774b54/net/log/net_log_event_type_list.h