Move smoothing filter to common audio and exp_filter to base/analytics.

webrtc/base/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 106 matching lines @@
     "constructormagic.h",
     "copyonwritebuffer.cc",
     "copyonwritebuffer.h",
     "criticalsection.cc",
     "criticalsection.h",
     "deprecation.h",
     "event.cc",
     "event.h",
     "event_tracer.cc",
     "event_tracer.h",
-    "exp_filter.cc",
-    "exp_filter.h",
     "file.cc",
     "file.h",
     "format_macros.h",
     "function_view.h",
     "ignore_wundef.h",
     "location.cc",
     "location.h",
     "md5.cc",
     "md5.h",
     "md5digest.cc",
@@ skipping 192 matching lines @@
           "task_queue_posix.cc",
         ]
       }
       if (is_win) {
         sources += [ "task_queue_win.cc" ]
       }
     }
   }
 }
 
+rtc_static_library("rtc_analytics") {
+  sources = [
+    "analytics/exp_filter.cc",
+    "analytics/exp_filter.h",
+  ]
+}
+
 config("rtc_base_warnings_config") {
   if (is_win && is_clang) {
     cflags = [
       # Disable warnings failing when compiling with Clang on Windows.
       # https://bugs.chromium.org/p/webrtc/issues/detail?id=5366
       "-Wno-sign-compare",
       "-Wno-missing-braces",
     ]
   }
 }
@@ skipping 416 matching lines @@
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
 
     deps = [
       "//base:base_java",
     ]
   }
 }