Rewrite is_linux flag for third_party directory.

This migrates is_linux (which is also set for chromeos) to explicitly
include chromeos as is_linux || is_chromeos in preparation for
separating those flags.

Bug: 1110266
Change-Id: I2820ed1b76d5eed10947d5150a392551efef18c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2326293
Commit-Queue: Sean McAllister <smcallis@google.com>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#793605}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 909c311b1c8a4c9d39ba0c74afee45fba319484c
diff --git a/BUILD.gn b/BUILD.gn
index b435499..fab8905 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -72,7 +72,7 @@
     } else if (current_cpu == "x64") {
       if (is_mac) {
         sources += crypto_sources_mac_x86_64
-      } else if (is_linux || is_android) {
+      } else if (is_linux || is_chromeos || is_android) {
         sources += crypto_sources_linux_x86_64
       } else {
         public_configs = [ ":no_asm_config" ]
@@ -80,13 +80,13 @@
     } else if (current_cpu == "x86") {
       if (is_mac) {
         sources += crypto_sources_mac_x86
-      } else if (is_linux || is_android) {
+      } else if (is_linux || is_chromeos || is_android) {
         sources += crypto_sources_linux_x86
       } else {
         public_configs = [ ":no_asm_config" ]
       }
     } else if (current_cpu == "arm") {
-      if (is_linux || is_android) {
+      if (is_linux || is_chromeos || is_android) {
         sources += crypto_sources_linux_arm
       } else if (is_ios) {
         sources += crypto_sources_ios_arm
@@ -94,7 +94,7 @@
         public_configs = [ ":no_asm_config" ]
       }
     } else if (current_cpu == "arm64") {
-      if (is_linux || is_android) {
+      if (is_linux || is_chromeos || is_android) {
         sources += crypto_sources_linux_aarch64
       } else if (is_ios) {
         sources += crypto_sources_ios_aarch64