Reland of Merge webrtc/video_engine/ into webrtc/video/ (patchset #2 id:300001 of https://codereview.webrtc.org/1507903005/ )

Reason for revert:
Bot breakage caused by TickTime::UseFakeClock has been removed.

Original issue's description:
> Revert of Merge webrtc/video_engine/ into webrtc/video/ (patchset #2 id:20001 of https://codereview.webrtc.org/1506773002/ )
>
> Reason for revert:
> Breaks Dr Memory Light https://build.chromium.org/p/client.webrtc/builders/Win%20DrMemory%20Light/builds/4643 and all the Android Tests bots.
>
> Original issue's description:
> > Merge webrtc/video_engine/ into webrtc/video/
> >
> > BUG=webrtc:1695
> > R=mflodman@webrtc.org
> >
> > Committed: https://crrev.com/03ef053202bc5d5ab43460eebf5403232f157646
> > Cr-Commit-Position: refs/heads/master@{#10926}
>
> TBR=mflodman@webrtc.org,pbos@webrtc.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:1695
>
> Committed: https://crrev.com/8237abf563bf4782ee104408b53cc8e55ce44518
> Cr-Commit-Position: refs/heads/master@{#10937}

BUG=webrtc:1695
TBR=mflodman@webrtc.org,kjellander@webrtc.org
NOPRESUBMIT=true

Review URL: https://codereview.webrtc.org/1510183002 .

Cr-Commit-Position: refs/heads/master@{#10948}
diff --git a/WATCHLISTS b/WATCHLISTS
index 72ca395..1fa11a7 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -32,9 +32,8 @@
     'java_files': {
       'filepath': '\.java$|\.xml$',
     },
-    'video_engine': {
-      'filepath': 'webrtc/video_engine/.*|'\
-                  'webrtc/video/.*',
+    'video': {
+      'filepath': 'webrtc/video/.*',
     },
     'voice_engine': {
       'filepath': 'webrtc/voice_engine/.*',
@@ -102,14 +101,15 @@
                      'bjornv@webrtc.org',
                      'minyue@webrtc.org',
                      'peah@webrtc.org'],
-    'video_engine': ['andresp@webrtc.org',
-                     'mflodman@webrtc.org',
-                     'perkj@webrtc.org',
-                     'solenberg@webrtc.org',
-                     'stefan@webrtc.org',
-                     'video-team@agora.io',
-                     'yujie.mao@webrtc.org',
-                     'zhengzhonghou@agora.io'],
+    'video': ['andresp@webrtc.org',
+              'mflodman@webrtc.org',
+              'pbos@webrtc.org',
+              'perkj@webrtc.org',
+              'solenberg@webrtc.org',
+              'stefan@webrtc.org',
+              'video-team@agora.io',
+              'yujie.mao@webrtc.org',
+              'zhengzhonghou@agora.io'],
     'voice_engine': ['andrew@webrtc.org',
                      'audio-team@agora.io',
                      'henrika@webrtc.org',