Fix GN error on ARM64.

Bug: 855859
Change-Id: Iaa0733f8c897d13323cf88c88e77d28f7892e3e2
Reviewed-on: https://chromium-review.googlesource.com/1113028Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569956}

AUTHORS

@@ -297,6 +297,7 @@ Habib Virji <habib.virji@samsung.com>
 Haeun Kim <haeungun@gmail.com>
 Haitao Feng <haitao.feng@intel.com>
 Halley Zhao <halley.zhao@intel.com>
+Halton Huo <halton.huo@gmail.com>
 Halton Huo <halton.huo@intel.com>
 Hans Hillen <hans.hillen@gmail.com>
 Haojian Wu <hokein.wu@gmail.com>

chrome/installer/linux/BUILD.gn

@@ -405,6 +405,8 @@ template("linux_package") {
       deb_arch = "amd64"
     } else if (current_cpu == "arm") {
       deb_arch = "arm"
+    } else if (current_cpu == "arm64") {
+      deb_arch = "arm64"
     } else if (current_cpu == "mipsel") {
       deb_arch = "mipsel"
     } else if (current_cpu == "mips64el") {
@@ -461,6 +463,8 @@ template("linux_package") {
         rpm_arch = "x86_64"
       } else if (current_cpu == "arm") {
         rpm_arch = "arm"
+      } else if (current_cpu == "arm64") {
+        rpm_arch = "arm64"
       } else if (current_cpu == "mipsel") {
         rpm_arch = "mipsel"
       } else if (current_cpu == "mips64el") {