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/base/basictypes.h

@@ -0,0 +1,74 @@
+/*
+ *  Copyright 2004 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.
+ */
+
+#ifndef WEBRTC_BASE_BASICTYPES_H_
+#define WEBRTC_BASE_BASICTYPES_H_
+
+#include <stddef.h>  // for NULL, size_t
+#include <stdint.h>  // for uintptr_t and (u)int_t types.
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"  // NOLINT
+#endif
+
+// Detect compiler is for x86 or x64.
+#if defined(__x86_64__) || defined(_M_X64) || \
+    defined(__i386__) || defined(_M_IX86)
+#define CPU_X86 1
+#endif
+
+// Detect compiler is for arm.
+#if defined(__arm__) || defined(_M_ARM)
+#define CPU_ARM 1
+#endif
+
+#if defined(CPU_X86) && defined(CPU_ARM)
+#error CPU_X86 and CPU_ARM both defined.
+#endif
+
+#if !defined(RTC_ARCH_CPU_BIG_ENDIAN) && !defined(RTC_ARCH_CPU_LITTLE_ENDIAN)
+// x86, arm or GCC provided __BYTE_ORDER__ macros
+#if CPU_X86 || CPU_ARM ||  \
+  (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+#define RTC_ARCH_CPU_LITTLE_ENDIAN
+#elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#define RTC_ARCH_CPU_BIG_ENDIAN
+#else
+#error RTC_ARCH_CPU_BIG_ENDIAN or RTC_ARCH_CPU_LITTLE_ENDIAN should be defined.
+#endif
+#endif
+
+#if defined(RTC_ARCH_CPU_BIG_ENDIAN) && defined(RTC_ARCH_CPU_LITTLE_ENDIAN)
+#error RTC_ARCH_CPU_BIG_ENDIAN and RTC_ARCH_CPU_LITTLE_ENDIAN both defined.
+#endif
+
+#if defined(WEBRTC_WIN)
+typedef int socklen_t;
+#endif
+
+// The following only works for C++
+#ifdef __cplusplus
+
+#ifndef ALIGNP
+#define ALIGNP(p, t)                                             \
+  (reinterpret_cast<uint8_t*>(((reinterpret_cast<uintptr_t>(p) + \
+  ((t) - 1)) & ~((t) - 1))))
+#endif
+
+#define RTC_IS_ALIGNED(p, a) (!((uintptr_t)(p) & ((a) - 1)))
+
+// Use these to declare and define a static local variable that gets leaked so
+// that its destructors are not called at exit.
+#define RTC_DEFINE_STATIC_LOCAL(type, name, arguments) \
+  static type& name = *new type arguments
+
+#endif  // __cplusplus
+
+#endif  // WEBRTC_BASE_BASICTYPES_H_