Detect CRC32 instructions on ARMv8.

src/core/SkCpu.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCpu.h"
 #include "SkOnce.h"
 
@@ skipping 53 matching lines @@
     static uint32_t read_cpu_features() {
         uint32_t features = 0;
 
         uint64_t android_features = android_getCpuFeatures();
         if (android_features & ANDROID_CPU_ARM_FEATURE_NEON    ) { features |= SkCpu::NEON    ; }
         if (android_features & ANDROID_CPU_ARM_FEATURE_NEON_FMA) { features |= SkCpu::NEON_FMA; }
         if (android_features & ANDROID_CPU_ARM_FEATURE_VFP_FP16) { features |= SkCpu::VFP_FP16; }
         return features;
     }
 
+#elif defined(SK_CPU_ARM64)         && \
+      defined(SK_BUILD_FOR_ANDROID) && \
+     !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK)
+    #include <cpu-features.h>
+
+    static uint32_t read_cpu_features() {
+        uint32_t features = 0;
+
+        uint64_t android_features = android_getCpuFeatures();
+        if (android_features & ANDROID_CPU_ARM64_FEATURE_CRC32) { features |= SkCpu::CRC32; }
+        return features;
+    }
+
 #else
     static uint32_t read_cpu_features() {
         return 0;
     }
 
 #endif
 
 uint32_t SkCpu::gCachedFeatures = 0;
 
 void SkCpu::CacheRuntimeFeatures() {
     static SkOnce once;
     once([] { gCachedFeatures = read_cpu_features(); });
 }