[Android WebView] Implement support for Network Information API and enable it.

[Android WebView] Implement support for Network Information API and enable it.

Merge into m50.

Currently Network Information API and everything related to the
NetworkChangeNotifier is disabled in WebView. This patch implements
the required parts to enable Network Information API in WebView.

The WebView implementation is based on NetworkChangeNotifier,
similar to chrome for Android. However the registration policy
is different:
1. whether we listen to network changes depends on the presence
of live WebView instances,
2. both the band-width and connectivity changes are propagated,
but a reduced network stack is involved as compared to the chrome
for android implementation,
3. for backward compatibility invoking setNetworkAvailable() on a
webview disables network information api.
4. The embedding application needs to have ACCESS_NETWORK_STATE
permission at the time webview process is initialized for the Network
Information API to work.

BUG=520088, 590383
TBR=torne@chromium.org

Committed: https://crrev.com/3673455317898f450211636919c2bef7a8e3fe0f
Cr-Commit-Position: refs/heads/master@{#376975}

Review URL: https://codereview.chromium.org/1659363003

Cr-Commit-Position: refs/heads/master@{#378807}
(cherry picked from commit bbaeb5b26d3ba544e801a2ad9f31955eb2309d89)

Committed: https://chromium.googlesource.com/chromium/src/+/b6d9df41994327103198921c3a7881f0d7fc9202

[timvolodine, 2016-03-03 19:45:53]

Description was changed from

==========
[Android WebView] Implement support for Network Information API and enable it.

Merge into m50.

Currently Network Information API and everything related to the
NetworkChangeNotifier is disabled in WebView. This patch implements
the required parts to enable Network Information API in WebView.

The WebView implementation is based on NetworkChangeNotifier,
similar to chrome for Android. However the registration policy
is different:
1. whether we listen to network changes depends on the presence
of live WebView instances,
2. both the band-width and connectivity changes are propagated,
but a reduced network stack is involved as compared to the chrome
for android implementation,
3. for backward compatibility invoking setNetworkAvailable() on a
webview disables network information api.
4. The embedding application needs to have ACCESS_NETWORK_STATE
permission at the time webview process is initialized for the Network
Information API to work.

BUG=520088, 590383

Committed: https://crrev.com/3673455317898f450211636919c2bef7a8e3fe0f
Cr-Commit-Position: refs/heads/master@{#376975}

Review URL: https://codereview.chromium.org/1659363003

Cr-Commit-Position: refs/heads/master@{#378807}
(cherry picked from commit bbaeb5b26d3ba544e801a2ad9f31955eb2309d89)
==========

to

==========
[Android WebView] Implement support for Network Information API and enable it.

Merge into m50.

Currently Network Information API and everything related to the
NetworkChangeNotifier is disabled in WebView. This patch implements
the required parts to enable Network Information API in WebView.

The WebView implementation is based on NetworkChangeNotifier,
similar to chrome for Android. However the registration policy
is different:
1. whether we listen to network changes depends on the presence
of live WebView instances,
2. both the band-width and connectivity changes are propagated,
but a reduced network stack is involved as compared to the chrome
for android implementation,
3. for backward compatibility invoking setNetworkAvailable() on a
webview disables network information api.
4. The embedding application needs to have ACCESS_NETWORK_STATE
permission at the time webview process is initialized for the Network
Information API to work.

BUG=520088, 590383
TBR=torne@chromium.org

Committed: https://crrev.com/3673455317898f450211636919c2bef7a8e3fe0f
Cr-Commit-Position: refs/heads/master@{#376975}

Review URL: https://codereview.chromium.org/1659363003

Cr-Commit-Position: refs/heads/master@{#378807}
(cherry picked from commit bbaeb5b26d3ba544e801a2ad9f31955eb2309d89)
==========

[timvolodine, 2016-03-03 19:46:08]

timvolodine@chromium.org changed reviewers:
+ torne@chromium.org

[timvolodine, 2016-03-03 19:49:28]

Description was changed from

==========
[Android WebView] Implement support for Network Information API and enable it.

Merge into m50.

Currently Network Information API and everything related to the
NetworkChangeNotifier is disabled in WebView. This patch implements
the required parts to enable Network Information API in WebView.

The WebView implementation is based on NetworkChangeNotifier,
similar to chrome for Android. However the registration policy
is different:
1. whether we listen to network changes depends on the presence
of live WebView instances,
2. both the band-width and connectivity changes are propagated,
but a reduced network stack is involved as compared to the chrome
for android implementation,
3. for backward compatibility invoking setNetworkAvailable() on a
webview disables network information api.
4. The embedding application needs to have ACCESS_NETWORK_STATE
permission at the time webview process is initialized for the Network
Information API to work.

BUG=520088, 590383
TBR=torne@chromium.org

Committed: https://crrev.com/3673455317898f450211636919c2bef7a8e3fe0f
Cr-Commit-Position: refs/heads/master@{#376975}

Review URL: https://codereview.chromium.org/1659363003

Cr-Commit-Position: refs/heads/master@{#378807}
(cherry picked from commit bbaeb5b26d3ba544e801a2ad9f31955eb2309d89)
==========

to

==========
[Android WebView] Implement support for Network Information API and enable it.

Merge into m50.

Currently Network Information API and everything related to the
NetworkChangeNotifier is disabled in WebView. This patch implements
the required parts to enable Network Information API in WebView.

The WebView implementation is based on NetworkChangeNotifier,
similar to chrome for Android. However the registration policy
is different:
1. whether we listen to network changes depends on the presence
of live WebView instances,
2. both the band-width and connectivity changes are propagated,
but a reduced network stack is involved as compared to the chrome
for android implementation,
3. for backward compatibility invoking setNetworkAvailable() on a
webview disables network information api.
4. The embedding application needs to have ACCESS_NETWORK_STATE
permission at the time webview process is initialized for the Network
Information API to work.

BUG=520088, 590383
TBR=torne@chromium.org

Committed: https://crrev.com/3673455317898f450211636919c2bef7a8e3fe0f
Cr-Commit-Position: refs/heads/master@{#376975}

Review URL: https://codereview.chromium.org/1659363003

Cr-Commit-Position: refs/heads/master@{#378807}
(cherry picked from commit bbaeb5b26d3ba544e801a2ad9f31955eb2309d89)

Committed:
https://chromium.googlesource.com/chromium/src/+/b6d9df41994327103198921c3a78...
==========

[timvolodine, 2016-03-03 19:49:30]

Committed patchset #1 (id:1) manually as
b6d9df41994327103198921c3a7881f0d7fc9202 (presubmit successful).