Lacros: is_cfi, use_thin_lto and use_cfi_cast default value update

Bug: 1157567
Change-Id: Icebc4367286fcb7372b9c6e7c8909b84d9dc9917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591487
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#838197}

build/config/compiler/compiler.gni

@@ -69,7 +69,8 @@ declare_args() {
   # Chrome's clang. crbug.com/1033839
   use_thin_lto = is_cfi || (is_official_build &&
                             (target_os == "android" ||
-                             (target_os == "chromeos" && is_chromeos_device)))
+                             ((is_chromeos_ash || is_chromeos_lacros)
+                              && is_chromeos_device)))
 
   # If true, use Goma for ThinLTO code generation where applicable.
   use_goma_thin_lto = false

build/config/sanitizers/sanitizers.gni

@@ -61,7 +61,7 @@ declare_args() {
   is_cfi =
       is_official_build &&
       (((target_os == "linux" || is_chromeos_lacros) && target_cpu == "x64") ||
-       (target_os == "chromeos" && is_chromeos_device && !is_chromeos_lacros))
+       ((is_chromeos_ash || is_chromeos_lacros) && is_chromeos_device))
 
   # Enable checks for indirect function calls via a function pointer.
   # TODO(pcc): remove this when we're ready to add these checks by default.
@@ -123,7 +123,7 @@ declare_args() {
   # Enable checks for bad casts: derived cast and unrelated cast.
   # TODO(krasin): remove this, when we're ready to add these checks by default.
   # https://crbug.com/626794
-  use_cfi_cast = is_cfi && target_os == "chromeos"
+  use_cfi_cast = is_cfi && (is_chromeos_ash || is_chromeos_lacros)
 }
 
 # Disable sanitizers for non-target toolchains.