Skia: plug ARMv8 CRC32 opts into Chrome.

skia/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 if (current_cpu == "arm") {
   import("//build/config/arm.gni")
 }
@@ skipping 527 matching lines @@
     ]
     set_sources_assignment_filter(sources_assignment_filter)
 
     # SkFontHost_mac.cpp uses API deprecated in iOS 7, crbug.com/408571
     cflags = [ "-Wno-deprecated-declarations" ]
   }
 }
 
 # Separated out so it can be compiled with different flags for SSE.
 if (!skia_build_no_opts) {
+  if (current_cpu == "arm64") {
+    source_set("skia_opts_crc32") {
+      sources = gypi_skia_opts.crc32_sources
+      cflags = [ "-march=armv8-a+crc" ]
+      visibility = [ ":skia_opts" ]
+      configs -= [ "//build/config/compiler:chromium_code" ]
+      configs += [
+        ":skia_config",
+        ":skia_library_config",
+        "//build/config/compiler:no_chromium_code",
+      ]
+    }
+  }
   if (current_cpu == "x86" || current_cpu == "x64") {
     source_set("skia_opts_sse3") {
       sources = gypi_skia_opts.ssse3_sources
       if (!is_win || is_clang) {
         cflags = [ "-mssse3" ]
       }
       if (is_win) {
         defines = [ "SK_CPU_SSE_LEVEL=31" ]
       }
       visibility = [ ":skia_opts" ]
@@ skipping 105 matching lines @@
         if (!arm_use_neon) {
           configs -= [ "//build/config/compiler:compiler_arm_fpu" ]
           cflags += [ "-mfpu=neon" ]
         }
       }
     } else {
       sources = gypi_skia_opts.none_sources
     }
   } else if (current_cpu == "arm64") {
     sources = gypi_skia_opts.arm64_sources
+    deps += [ ":skia_opts_crc32" ]
   } else if (current_cpu == "mipsel") {
     cflags += [ "-fomit-frame-pointer" ]
 
     if (mips_dsp_rev >= 1) {
       sources = gypi_skia_opts.mips_dsp_sources
     } else {
       sources = gypi_skia_opts.none_sources
     }
   } else if (current_cpu == "mips64el") {
     cflags += [ "-fomit-frame-pointer" ]
@@ skipping 76 matching lines @@
 
     deps = [
       ":skia",
       "//base",
       "//base/test:test_support",
       "//build/config/sanitizers:deps",
       "//build/win:default_exe_manifest",
     ]
   }
 }