Update audio_processing module

Corresponds to upstream commit 524e9b043e7e86fd72353b987c9d5f6a1ebf83e1

Update notes:

 * Pull in third party license file

 * Replace .gypi files with BUILD.gn to keep track of what changes
   upstream

 * Bunch of new filse pulled in as dependencies

 * Won't build yet due to changes needed on top of these

webrtc/system_wrappers/source/trace_posix.cc

@@ -0,0 +1,90 @@
+/*
+ *  Copyright (c) 2012 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.
+ */
+
+#include "webrtc/system_wrappers/source/trace_posix.h"
+
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <time.h>
+
+namespace webrtc {
+
+TracePosix::TracePosix()
+    : crit_sect_(*CriticalSectionWrapper::CreateCriticalSection()) {
+  struct timeval system_time_high_res;
+  gettimeofday(&system_time_high_res, 0);
+  prev_api_tick_count_ = prev_tick_count_ = system_time_high_res.tv_sec;
+}
+
+TracePosix::~TracePosix() {
+  delete &crit_sect_;
+}
+
+int32_t TracePosix::AddTime(char* trace_message, const TraceLevel level) const {
+  struct timeval system_time_high_res;
+  if (gettimeofday(&system_time_high_res, 0) == -1) {
+    return -1;
+  }
+  struct tm buffer;
+  const struct tm* system_time =
+    localtime_r(&system_time_high_res.tv_sec, &buffer);
+
+  const uint32_t ms_time = system_time_high_res.tv_usec / 1000;
+  uint32_t prev_tickCount = 0;
+  {
+    CriticalSectionScoped lock(&crit_sect_);
+    if (level == kTraceApiCall) {
+      prev_tickCount = prev_tick_count_;
+      prev_tick_count_ = ms_time;
+    } else {
+      prev_tickCount = prev_api_tick_count_;
+      prev_api_tick_count_ = ms_time;
+    }
+  }
+
+  uint32_t dw_delta_time = ms_time - prev_tickCount;
+  if (prev_tickCount == 0) {
+    dw_delta_time = 0;
+  }
+  if (dw_delta_time > 0x0fffffff) {
+    // Either wraparound or data race.
+    dw_delta_time = 0;
+  }
+  if (dw_delta_time > 99999) {
+    dw_delta_time = 99999;
+  }
+
+  sprintf(trace_message, "(%2u:%2u:%2u:%3u |%5lu) ", system_time->tm_hour,
+          system_time->tm_min, system_time->tm_sec, ms_time,
+          static_cast<unsigned long>(dw_delta_time));
+  // Messages are 22 characters.
+  return 22;
+}
+
+int32_t TracePosix::AddDateTimeInfo(char* trace_message) const {
+  time_t t;
+  time(&t);
+  char buffer[26];  // man ctime says buffer should have room for >=26 bytes.
+  sprintf(trace_message, "Local Date: %s", ctime_r(&t, buffer));
+  int32_t len = static_cast<int32_t>(strlen(trace_message));
+
+  if ('\n' == trace_message[len - 1]) {
+    trace_message[len - 1] = '\0';
+    --len;
+  }
+
+  // Messages is 12 characters.
+  return len + 1;
+}
+
+}  // namespace webrtc