Step 1 of opts_crc32 rollout.

gyp/opts.gyp

Index: gyp/opts.gyp
diff --git a/gyp/opts.gyp b/gyp/opts.gyp
index ad8da337698fe8e578f4da29db2cb183d99a9e13..21edd859b0d53b1647f97db912ae9907b4a15f1f 100644
--- a/gyp/opts.gyp
+++ b/gyp/opts.gyp
@@ -71,6 +71,7 @@
 
         [ 'skia_arch_type == "arm64"', {
           'sources': [ '<@(arm64_sources)' ],
+          'dependencies': [ 'opts_crc32' ]
         }],
 
         [ 'skia_android_framework', {
@@ -83,6 +84,22 @@
       ],
     },
     {
+      'target_name': 'opts_crc32',
+      'product_name': 'skia_opts_crc32',
+      'type': 'static_library',
+      'standalone_static_library': 1,
+      'dependencies': [ 'core.gyp:*' ],
+      'include_dirs': [
+          '../include/private',
+          '../src/core',
+          '../src/utils',
+      ],
+      'sources': [ '<@(crc32_sources)' ],
+      'conditions': [
+        [ 'not skia_android_framework', { 'cflags': [ '-march=armv8-a+crc' ] }],
+      ],
+    },
+    {
       'target_name': 'opts_ssse3',
       'product_name': 'skia_opts_ssse3',
       'type': 'static_library',