Support for arm64 build.

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" || current_cpu == "arm64") {
   import("//build/config/arm.gni")
 }
@@ skipping 458 matching lines @@
 source_set("skia_opts") {
   cflags = []
   defines = []
 
   if (current_cpu == "x86" || current_cpu == "x64") {
     sources = gypi_skia_opts.sse2_sources + gypi_skia_opts.ssse3_sources +
               gypi_skia_opts.sse41_sources + gypi_skia_opts.avx_sources
     if (is_linux || is_mac) {
       cflags += [ "-msse4.1" ]
     }
-  } else if (current_cpu == "arm") {
+  } else if (current_cpu == "arm" || current_cpu == "arm64") {
     # The assembly uses the frame pointer register (r7 in Thumb/r11 in
     # ARM), the compiler doesn't like that.
     cflags += [ "-fomit-frame-pointer" ]
     if (arm_version >= 7 && (arm_use_neon || arm_optionally_use_neon)) {
       sources = gypi_skia_opts.armv7_sources
       if (arm_use_neon || arm_optionally_use_neon) {
         sources += gypi_skia_opts.neon_sources
 
         # Root build config sets -mfpu=$arm_fpu, which we expect to be neon
         # when running this.
@@ skipping 53 matching lines @@
   deps = [
     ":skia",
     "//base",
     "//base/test:run_all_unittests",
     "//cc:test_support",  # TODO: Fix this test to not depend on cc.
     "//testing/gtest",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }