Enable FIXED_POINT and -O3 for Opus when building for ARM

third_party/opus/opus.gyp

Index: third_party/opus/opus.gyp
diff --git a/third_party/opus/opus.gyp b/third_party/opus/opus.gyp
index 3b37f42b795afd53725485d7f70ac96d51dd4d70..be8cbd7ff49f3d98d22c6c58f608e9e00abb9dbe 100644
--- a/third_party/opus/opus.gyp
+++ b/third_party/opus/opus.gyp
@@ -5,14 +5,17 @@
 {
   '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_arm_optimization%': 1,
       }, {
         'use_opus_fixed_point%': 0,
+      }],
+      ['target_arch=="arm" or target_arch=="armv7"', {
+        'use_opus_arm_optimization%': 1,
+      }, {
         '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,
@@ -55,7 +58,7 @@
             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': [
@@ -67,6 +70,10 @@
             ],
           },
         }],
+        ['os_posix==1 and (target_arch=="arm" or target_arch=="armv7" or target_arch=="arm64")', {
+          'cflags!': ['-Os'],
+          'cflags': ['-O3'],
+        }],
         ['use_opus_fixed_point==0', {
           'include_dirs': [
             'src/silk/float',