Reland "Move smoothing filter to common audio".

The original CL was this https://codereview.webrtc.org/2484153002/

Due to failure with internal trial servers, it was reverted. This CL tries to reland it.

BUG=webrtc:6443

Review-Url: https://codereview.webrtc.org/2520003005
Cr-Commit-Position: refs/heads/master@{#15227}

webrtc/modules/video_coding/BUILD.gn

@@ -93,6 +93,7 @@ rtc_static_library("video_coding") {
     ":webrtc_vp8",
     ":webrtc_vp9",
     "../..:webrtc_common",
+    "../../base/analytics:rtc_analytics",
     "../../common_video",
     "../../system_wrappers",
   ]
@@ -124,6 +125,7 @@ rtc_static_library("video_coding_utility") {
   }
 
   deps = [
+    "../../base/analytics:rtc_analytics",
     "../../common_video",
     "../../system_wrappers",
   ]

webrtc/modules/video_coding/media_opt_util.h

@@ -16,7 +16,7 @@
 
 #include <memory>
 
-#include "webrtc/base/exp_filter.h"
+#include "webrtc/base/analytics/exp_filter.h"
 #include "webrtc/modules/video_coding/internal_defines.h"
 #include "webrtc/system_wrappers/include/trace.h"
 #include "webrtc/typedefs.h"

webrtc/modules/video_coding/utility/frame_dropper.h

@@ -13,7 +13,7 @@
 
 #include <cstddef>
 
-#include "webrtc/base/exp_filter.h"
+#include "webrtc/base/analytics/exp_filter.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {