Add a histogram metric tracking for how long audio RTP packets are sent

webrtc/rtc_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 159 matching lines @@
     "stringencode.h",
     "stringize_macros.h",
     "stringutils.cc",
     "stringutils.h",
     "swap_queue.h",
     "template_util.h",
     "thread_annotations.h",
     "thread_checker.h",
     "thread_checker_impl.cc",
     "thread_checker_impl.h",
+    "time_interval.cc",
+    "time_interval.h",
     "timestampaligner.cc",
     "timestampaligner.h",
     "timeutils.cc",
     "timeutils.h",
     "trace_event.h",
     "type_traits.h",
   ]
 
   deps += [ "..:webrtc_common" ]
 
@@ skipping 645 matching lines @@
       "refcountedobject_unittest.cc",
       "safe_compare_unittest.cc",
       "safe_minmax_unittest.cc",
       "string_to_number_unittest.cc",
       "stringencode_unittest.cc",
       "stringize_macros_unittest.cc",
       "stringutils_unittest.cc",
       "swap_queue_unittest.cc",
       "thread_annotations_unittest.cc",
       "thread_checker_unittest.cc",
+      "time_interval_unittest.cc",
       "timestampaligner_unittest.cc",
       "timeutils_unittest.cc",
       "virtualsocket_unittest.cc",
     ]
     deps = [
       ":rtc_base",
       ":rtc_base_approved",
       ":rtc_base_tests_main",
       ":rtc_base_tests_utils",
       ":rtc_task_queue",
@@ skipping 176 matching lines @@
 if (is_android) {
   android_library("base_java") {
     java_files = [
       "java/src/org/webrtc/ContextUtils.java",
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
   }
 }