[Media Router] Allow casting new media to sink with existing route.

[Media Router] Allow casting new media to sink with existing route.

This change allows for one button push to stop casting to a sink and
then immediately create a new route to the same sink with the selected
source. The makes the user experience smoother by not making them stop
the current cast and then start a new one manually in two stops.

Some shortcomings of this change that will be addressed in the future:

 - At least for mirroring, it's possible to avoid stopping the route and
   just switch the stream sources. This probably requires adding a new
   API to the extension.

 - The button will currently allow users to re-cast the current source,
   stopping the current route and starting a new one, even though this
   isn't necessary. When both the old and new sources are tabs, the tab
   IDs could be checked, but other cases would have to be handled in MR
   or the extension.

BUG=614144
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2002293003
Cr-Commit-Position: refs/heads/master@{#397457}
(cherry picked from commit 4680358215ff217eb6b0073c4be2243738369957)

[btolsch, 2016-06-13 18:18:38]

Description was changed from

==========
[Media Router] Allow casting new media to sink with existing route.

This change allows for one button push to stop casting to a sink and
then immediately create a new route to the same sink with the selected
source. The makes the user experience smoother by not making them stop
the current cast and then start a new one manually in two stops.

Some shortcomings of this change that will be addressed in the future:

 - At least for mirroring, it's possible to avoid stopping the route and
   just switch the stream sources. This probably requires adding a new
   API to the extension.

 - The button will currently allow users to re-cast the current source,
   stopping the current route and starting a new one, even though this
   isn't necessary. When both the old and new sources are tabs, the tab
   IDs could be checked, but other cases would have to be handled in MR
   or the extension.

BUG=614144
R=apacible@chromium.org, amp@chromium.org, mfoltz@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2002293003
Cr-Commit-Position: refs/heads/master@{#397457}
(cherry picked from commit 4680358215ff217eb6b0073c4be2243738369957)
==========

to

==========
[Media Router] Allow casting new media to sink with existing route.

This change allows for one button push to stop casting to a sink and
then immediately create a new route to the same sink with the selected
source. The makes the user experience smoother by not making them stop
the current cast and then start a new one manually in two stops.

Some shortcomings of this change that will be addressed in the future:

 - At least for mirroring, it's possible to avoid stopping the route and
   just switch the stream sources. This probably requires adding a new
   API to the extension.

 - The button will currently allow users to re-cast the current source,
   stopping the current route and starting a new one, even though this
   isn't necessary. When both the old and new sources are tabs, the tab
   IDs could be checked, but other cases would have to be handled in MR
   or the extension.

BUG=614144
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2002293003
Cr-Commit-Position: refs/heads/master@{#397457}
(cherry picked from commit 4680358215ff217eb6b0073c4be2243738369957)
==========

[btolsch, 2016-06-13 18:18:38]

btolsch@chromium.org changed reviewers:
- amp@chromium.org, mfoltz@chromium.org

[btolsch, 2016-06-13 18:19:16]

Merging to M52, no conflicts. PTAL, thanks!

[apacible, 2016-06-13 18:21:00]

rs lgtm

[apacible, 2016-06-13 18:21:17]

You'll need a histograms owner as well.

[btolsch, 2016-06-13 18:23:21]

btolsch@chromium.org changed reviewers:
+ isherman@chromium.org

[btolsch, 2016-06-13 18:23:21]

+isherman for histograms.xml

[Ilya Sherman, 2016-06-13 21:57:25]

histograms.xml lgtm

[btolsch, 2016-06-13 22:39:50]

The CQ bit was checked by btolsch@chromium.org

[commit-bot: I haz the power, 2016-06-13 22:40:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2062913002/1

[commit-bot: I haz the power, 2016-06-13 22:42:13]

Description was changed from

==========
[Media Router] Allow casting new media to sink with existing route.

This change allows for one button push to stop casting to a sink and
then immediately create a new route to the same sink with the selected
source. The makes the user experience smoother by not making them stop
the current cast and then start a new one manually in two stops.

Some shortcomings of this change that will be addressed in the future:

 - At least for mirroring, it's possible to avoid stopping the route and
   just switch the stream sources. This probably requires adding a new
   API to the extension.

 - The button will currently allow users to re-cast the current source,
   stopping the current route and starting a new one, even though this
   isn't necessary. When both the old and new sources are tabs, the tab
   IDs could be checked, but other cases would have to be handled in MR
   or the extension.

BUG=614144
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2002293003
Cr-Commit-Position: refs/heads/master@{#397457}
(cherry picked from commit 4680358215ff217eb6b0073c4be2243738369957)
==========

to

==========
[Media Router] Allow casting new media to sink with existing route.

This change allows for one button push to stop casting to a sink and
then immediately create a new route to the same sink with the selected
source. The makes the user experience smoother by not making them stop
the current cast and then start a new one manually in two stops.

Some shortcomings of this change that will be addressed in the future:

 - At least for mirroring, it's possible to avoid stopping the route and
   just switch the stream sources. This probably requires adding a new
   API to the extension.

 - The button will currently allow users to re-cast the current source,
   stopping the current route and starting a new one, even though this
   isn't necessary. When both the old and new sources are tabs, the tab
   IDs could be checked, but other cases would have to be handled in MR
   or the extension.

BUG=614144
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2002293003
Cr-Commit-Position: refs/heads/master@{#397457}
(cherry picked from commit 4680358215ff217eb6b0073c4be2243738369957)
==========

[commit-bot: I haz the power, 2016-06-13 22:42:15]

Committed patchset #1 (id:1)