Enable FIXED_POINT and -O3 for Opus when building for ARM.

third_party/opus/opus.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
+  'target_defaults': {
+    'variables': {
+      # Performance gains are substantial on ARM (v7,v8) with -O3 over the
+      # default -Os configured in common.gypi.
+      'release_optimize': '3',
+      'debug_optimize': '3',
+    },
+  },
   'variables': {
     'conditions': [
-      ['((OS=="android" or chromeos==1) and target_arch=="arm") or (OS=="ios" and target_arch=="armv7")', {
+      ['target_arch=="arm" or target_arch=="armv7" or target_arch=="arm64"', {
         'use_opus_fixed_point%': 1,
+      }, {
+        'use_opus_fixed_point%': 0,
+      }],
+      ['target_arch=="arm" or target_arch=="armv7"', {
         'use_opus_arm_optimization%': 1,
       }, {
-        'use_opus_fixed_point%': 0,
         'use_opus_arm_optimization%': 0,
       }],
-      ['(OS=="android" or chromeos==1) and target_arch=="arm"', {
+      ['target_arch=="arm"', {
         'use_opus_rtcd%': 1,
       }, {
         'use_opus_rtcd%': 0,
       }],
     ],
   },
   'targets': [
     {
       'target_name': 'opus',
       'type': 'static_library',
@@ skipping 22 matching lines @@
         }, {
           'defines': [
             'USE_ALLOCA',
             'inline=__inline',
           ],
           'msvs_disabled_warnings': [
             4305,  # Disable truncation warning in celt/pitch.c .
             4334,  # Disable 32-bit shift warning in src/opus_encoder.c .
           ],
         }],
-        [ 'os_posix==1 and OS!="android"', {
+        ['os_posix==1 and OS!="android"', {
           # Suppress a warning given by opus_decoder.c that tells us
           # optimizations are turned off.
           'cflags': [
             '-Wno-#pragma-messages',
           ],
           'xcode_settings': {
             'WARNING_CFLAGS': [
               '-Wno-#pragma-messages',
             ],
           },
@@ skipping 66 matching lines @@
       'sources': [
         'src/src/opus_demo.c',
       ],
       'include_dirs': [
         'src/celt',
         'src/silk',
       ],
     },  # target opus_demo
   ]
 }