Revert "Remove CpuMonitor and related, unused, code."

Revert "Remove CpuMonitor and related, unused, code."

This reverts commit 1a24012680f25440aa1d117373df2af14cdc2fc1.

TBR=tommi@webrtc.org,pthatcher@webrtc.org
BUG=

This breaks 
http://build.chromium.org/p/chromium.webrtc.fyi/builders/Linux/builds/20148/steps/compile/logs/stdio

Committed: https://chromium.googlesource.com/external/webrtc/+/a472e968c95fb14e63ec42f453551d0967573ea8

[guoweis_webrtc, 2015-08-19 00:08:54]

Committed patchset #1 (id:1) manually as
a472e968c95fb14e63ec42f453551d0967573ea8 (presubmit successful).

[guoweis_webrtc, 2015-08-19 00:09:44]

On 2015/08/19 00:08:54, guoweis wrote:
> Committed patchset #1 (id:1) manually as
> a472e968c95fb14e63ec42f453551d0967573ea8 (presubmit successful).

While investigating my own build break, I noticed that this is also breaking the
chromium.fyi build.

I have landed the revert.

[tommi (sloooow) - chröme, 2015-08-19 08:38:27]

On 2015/08/19 00:09:44, guoweis wrote:
> On 2015/08/19 00:08:54, guoweis wrote:
> > Committed patchset #1 (id:1) manually as
> > a472e968c95fb14e63ec42f453551d0967573ea8 (presubmit successful).
> 
> While investigating my own build break, I noticed that this is also breaking
the
> chromium.fyi build.
> 
> I have landed the revert.

Thanks. I'm fixing the issue in Chromium and will then reland.

[tommi (sloooow) - chröme, 2015-08-19 10:58:02]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/1296763007/ by tommi@chromium.org.

The reason for reverting is: Re-landing the change that removes the CpuMonitor
class after having fixed the build issue in Chromium..

[tommi, 2015-08-19 10:59:38]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/1290033005/ by tommi@webrtc.org.

The reason for reverting is: (retrying with my webrtc account...)
The reason for reverting is: Re-landing the change that removes the CpuMonitor
class after having fixed the build issue in Chromium...