Detect CRC32 instructions on ARMv8.

src/core/SkCpu.cpp

Index: src/core/SkCpu.cpp
diff --git a/src/core/SkCpu.cpp b/src/core/SkCpu.cpp
index 0858abd40a7fcf22328926797c04ce034561372f..0f1c7511a645481f6b04caf5ba13a182933d0d74 100644
--- a/src/core/SkCpu.cpp
+++ b/src/core/SkCpu.cpp
@@ -71,6 +71,19 @@
         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;