[DevTools] Ensure that tab agent hosts get "page" type

[DevTools] Ensure that tab agent hosts get "page" type

If we were to create DevToolsAgentHost for a WebContents
before appending that to a tab strip, we wrongly assigned
"other" type to it. This happens, for example, when devtools
is discovering all agent hosts for newly created web contents.

Regressed in crrev.com/7a0e557c4434a838ab29021ae039504fbab4f564

BUG=717003
Review-Url: https://codereview.chromium.org/2858763002
Cr-Commit-Position: refs/heads/master@{#468815}
Committed: https://chromium.googlesource.com/chromium/src/+/16fd697aa90b4a2dd30ff37ae51fd52a7c157a98

[dgozman, 2017-05-02 21:00:33]

The CQ bit was checked by dgozman@chromium.org to run a CQ dry run

[dgozman, 2017-05-02 21:00:46]

dgozman@chromium.org changed reviewers:
+ pfeldman@chromium.org

[dgozman, 2017-05-02 21:00:46]

Could you please take a look?

[commit-bot: I haz the power, 2017-05-02 21:00:55]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-02 21:54:32]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-05-02 21:54:33]

Dry run: This issue passed the CQ dry run.

[pfeldman, 2017-05-02 23:03:23]

lgtm

[dgozman, 2017-05-02 23:18:10]

The CQ bit was checked by dgozman@chromium.org

[commit-bot: I haz the power, 2017-05-02 23:18:59]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-02 23:33:58]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493767090774490, "parent_rev":
"81ccbcd9c5b6de950869d165794b7072a6ee7769", "commit_rev":
"16fd697aa90b4a2dd30ff37ae51fd52a7c157a98"}

[commit-bot: I haz the power, 2017-05-02 23:34:08]

Description was changed from

==========
[DevTools] Ensure that tab agent hosts get "page" type

If we were to create DevToolsAgentHost for a WebContents
before appending that to a tab strip, we wrongly assigned
"other" type to it. This happens, for example, when devtools
is discovering all agent hosts for newly created web contents.

Regressed in crrev.com/7a0e557c4434a838ab29021ae039504fbab4f564

BUG=717003
==========

to

==========
[DevTools] Ensure that tab agent hosts get "page" type

If we were to create DevToolsAgentHost for a WebContents
before appending that to a tab strip, we wrongly assigned
"other" type to it. This happens, for example, when devtools
is discovering all agent hosts for newly created web contents.

Regressed in crrev.com/7a0e557c4434a838ab29021ae039504fbab4f564

BUG=717003

Review-Url: https://codereview.chromium.org/2858763002
Cr-Commit-Position: refs/heads/master@{#468815}
Committed:
https://chromium.googlesource.com/chromium/src/+/16fd697aa90b4a2dd30ff37ae51f...
==========

[commit-bot: I haz the power, 2017-05-02 23:34:09]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/16fd697aa90b4a2dd30ff37ae51f...