Reland of Make AudioSinkInterface::Data hold a const pointer to the audio buffer.

Reland of Make AudioSinkInterface::Data hold a const pointer to the audio buffer. (patchset #1 id:1 of https://codereview.webrtc.org/2877013002/ )

Reason for revert:
Re-land the original CL because the reverting it didn't fix the problem.

Original issue's description:
> Revert of Make AudioSinkInterface::Data hold a const pointer to the audio buffer. (patchset #1 id:1 of https://codereview.webrtc.org/2873803002/ )
> 
> Reason for revert:
> Reverted because it possibly breaks the internal project.
> 
> Original issue's description:
> > Make AudioSinkInterface::Data hold a const pointer to the audio buffer.
> > 
> > This is in preparation for https://codereview.webrtc.org/2750783004/, where
> > requiring a non-const pointer for AudioSinkInterface would force an unmuting
> > and zeroing of every frame.
> > 
> > BUG=webrtc:7343
> > 
> > Review-Url: https://codereview.webrtc.org/2873803002
> > Cr-Commit-Position: refs/heads/master@{#18107}
> > Committed: https://chromium.googlesource.com/external/webrtc/+/38605965bd68ad1e376c530883041b9c12f26d3b
> 
> TBR=solenberg@webrtc.org,henrik.lundin@webrtc.org,yujo@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:7343
> 
> Review-Url: https://codereview.webrtc.org/2877013002
> Cr-Commit-Position: refs/heads/master@{#18112}
> Committed: https://chromium.googlesource.com/external/webrtc/+/c904634823fe3021d24116de246c95a7d7a2fb91

TBR=solenberg@webrtc.org,henrik.lundin@webrtc.org,yujo@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7343
Review-Url: https://codereview.webrtc.org/2880663003
Cr-Commit-Position: refs/heads/master@{#18113}
Committed: https://chromium.googlesource.com/external/webrtc/+/0acebe223864e5bd229647db4c4e45946c7eff86

[Zhi Huang, 2017-05-12 05:07:25]

The CQ bit was checked by zhihuang@webrtc.org

[Zhi Huang, 2017-05-12 05:07:26]

Created Reland of Make AudioSinkInterface::Data hold a const pointer to the
audio buffer.

[commit-bot: I haz the power, 2017-05-12 05:07:34]

CQ is trying da patch.

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

[commit-bot: I haz the power, 2017-05-12 05:07:37]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1494565645796280, "parent_rev":
"c904634823fe3021d24116de246c95a7d7a2fb91", "commit_rev":
"0acebe223864e5bd229647db4c4e45946c7eff86"}

[commit-bot: I haz the power, 2017-05-12 05:07:41]

Description was changed from

==========
Reland of Make AudioSinkInterface::Data hold a const pointer to the audio
buffer. (patchset #1 id:1 of https://codereview.webrtc.org/2877013002/ )

Reason for revert:
Re-land the original CL because the reverting it didn't fix the problem.

Original issue's description:
> Revert of Make AudioSinkInterface::Data hold a const pointer to the audio
buffer. (patchset #1 id:1 of https://codereview.webrtc.org/2873803002/ )
> 
> Reason for revert:
> Reverted because it possibly breaks the internal project.
> 
> Original issue's description:
> > Make AudioSinkInterface::Data hold a const pointer to the audio buffer.
> > 
> > This is in preparation for https://codereview.webrtc.org/2750783004/, where
> > requiring a non-const pointer for AudioSinkInterface would force an unmuting
> > and zeroing of every frame.
> > 
> > BUG=webrtc:7343
> > 
> > Review-Url: https://codereview.webrtc.org/2873803002
> > Cr-Commit-Position: refs/heads/master@{#18107}
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/38605965bd68ad1e376c53088...
> 
> TBR=solenberg@webrtc.org,henrik.lundin@webrtc.org,yujo@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:7343
> 
> Review-Url: https://codereview.webrtc.org/2877013002
> Cr-Commit-Position: refs/heads/master@{#18112}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/c904634823fe3021d24116de2...

TBR=solenberg@webrtc.org,henrik.lundin@webrtc.org,yujo@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7343
==========

to

==========
Reland of Make AudioSinkInterface::Data hold a const pointer to the audio
buffer. (patchset #1 id:1 of https://codereview.webrtc.org/2877013002/ )

Reason for revert:
Re-land the original CL because the reverting it didn't fix the problem.

Original issue's description:
> Revert of Make AudioSinkInterface::Data hold a const pointer to the audio
buffer. (patchset #1 id:1 of https://codereview.webrtc.org/2873803002/ )
> 
> Reason for revert:
> Reverted because it possibly breaks the internal project.
> 
> Original issue's description:
> > Make AudioSinkInterface::Data hold a const pointer to the audio buffer.
> > 
> > This is in preparation for https://codereview.webrtc.org/2750783004/, where
> > requiring a non-const pointer for AudioSinkInterface would force an unmuting
> > and zeroing of every frame.
> > 
> > BUG=webrtc:7343
> > 
> > Review-Url: https://codereview.webrtc.org/2873803002
> > Cr-Commit-Position: refs/heads/master@{#18107}
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/38605965bd68ad1e376c53088...
> 
> TBR=solenberg@webrtc.org,henrik.lundin@webrtc.org,yujo@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:7343
> 
> Review-Url: https://codereview.webrtc.org/2877013002
> Cr-Commit-Position: refs/heads/master@{#18112}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/c904634823fe3021d24116de2...

TBR=solenberg@webrtc.org,henrik.lundin@webrtc.org,yujo@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7343

Review-Url: https://codereview.webrtc.org/2880663003
Cr-Commit-Position: refs/heads/master@{#18113}
Committed:
https://chromium.googlesource.com/external/webrtc/+/0acebe223864e5bd229647db4...
==========

[commit-bot: I haz the power, 2017-05-12 05:07:42]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/0acebe223864e5bd229647db4...

[hlundin-webrtc, 2017-05-12 07:14:23]

lgtm