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

talk/media/webrtc/webrtcvideoengine2.h

Index: talk/media/webrtc/webrtcvideoengine2.h
diff --git a/talk/media/webrtc/webrtcvideoengine2.h b/talk/media/webrtc/webrtcvideoengine2.h
index a49f14aed95b5d958dcca8a638fdf1444dcaa1b0..9d04526f4b33d305512c78c0960908876c1093eb 100644
--- a/talk/media/webrtc/webrtcvideoengine2.h
+++ b/talk/media/webrtc/webrtcvideoengine2.h
@@ -36,6 +36,7 @@
 #include "talk/media/webrtc/webrtcvideochannelfactory.h"
 #include "talk/media/webrtc/webrtcvideodecoderfactory.h"
 #include "talk/media/webrtc/webrtcvideoencoderfactory.h"
+#include "webrtc/base/cpumonitor.h"
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/base/thread_annotations.h"
@@ -53,6 +54,7 @@ class VideoEncoder;
 }
 
 namespace rtc {
+class CpuMonitor;
 class Thread;
 }  // namespace rtc