Reland of Add aecdump support to audioproc_f.

Reland of Add aecdump support to audioproc_f. (patchset #2 id:250001 of https://codereview.webrtc.org/1423693008/ )

Reason for revert:
Oh dear, this broke compilation.
I guess more was built on top of this CL before I reverted it.

Reverting now for futher investigation (and re-land using CQ)

Original issue's description:
> Revert of Add aecdump support to audioproc_f. (patchset #8 id:200001 of https://codereview.webrtc.org/1409943002/ )
>
> Reason for revert:
> This breaks iOS GYP generation as described on http://www.webrtc.org/native-code/ios
> I'm going to drive getting the build_with_libjingle=1 setting removed from the bots to match the official instructions.
>
> See https://code.google.com/p/webrtc/issues/detail?id=4653 for more context, as this is exactly what that issue tries to solve.
>
> Original issue's description:
> > Add aecdump support to audioproc_f.
> >
> > Add a new interface to abstract away file operations. This CL temporarily
> > removes support for dumping the output of reverse streams. It will be easy to
> > restore in the new framework, although we may decide to only allow it with
> > the aecdump format.
> >
> > We also now require the user to specify the output format, rather than
> > defaulting to the input format.
> >
> > TEST=Bit-exact output to the previous audioproc_f version using an input wav
> > file, and to the legacy audioproc using an aecdump file.
> >
> > Committed: https://crrev.com/bdafe31b86e9819b0adb9041f87e6194b7422b08
> > Cr-Commit-Position: refs/heads/master@{#10460}
>
> TBR=aluebs@webrtc.org,peah@webrtc.org,andrew@webrtc.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://crrev.com/d279941bb54bfdc6e7324bf36cac76581474b96d
> Cr-Commit-Position: refs/heads/master@{#10523}

TBR=aluebs@webrtc.org,peah@webrtc.org,andrew@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/86b40506b3443d5cf0c5ec838e44edd9f4376c01
Cr-Commit-Position: refs/heads/master@{#10524}

[kjellander_webrtc, 2015-11-05 14:22:36]

Created Reland of Add aecdump support to audioproc_f.

[commit-bot: I haz the power, 2015-11-05 14:22:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1419953010/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1419953010/1

[commit-bot: I haz the power, 2015-11-05 14:23:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-05 14:23:20]

Patchset 1 (id:??) landed as
https://crrev.com/86b40506b3443d5cf0c5ec838e44edd9f4376c01
Cr-Commit-Position: refs/heads/master@{#10524}