Reland "[Lacros] Use cfi and thin_lto for Lacros official build"

This is a reland of efe87dc0

Original issue was fixed in crrev.com/c/2584633
Locally tested Lacros can build with these gn args.

Original change's description:
> [Lacros] Use cfi and thin_lto for Lacros official build
>
> CFI and ThinLTO were disabled on the simple chrome workflow
> because they increase build time quite a bit.
> But for official build, then should be enabled.
>
> Bug: 1157567
> Change-Id: I33a9eac37221f31da9a6725b19992d5daded72dc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586085
> Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
> Reviewed-by: Sven Zheng <svenzheng@chromium.org>
> Commit-Queue: Sven Zheng <svenzheng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#835956}

Bug: 1157567
Change-Id: Ib8d009f1e0e8efe8b8c3033086c9df4b6d596175
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2590075Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836791}

tools/mb/mb_config.pyl

@@ -1592,7 +1592,7 @@
     ],
 
     'chromeos_amd64-generic_lacros_official': [
-      'chromeos_amd64-generic', 'amd64-lacros', 'official', 'minimal_symbols',
+      'chromeos_amd64-generic', 'amd64-lacros', 'official', 'minimal_symbols', 'cfi', 'thin_lto',
     ],
 
     'chromeos_amd64-generic_lacros_rel': [

tools/mb/mb_config_expectations/chrome.json

@@ -240,6 +240,7 @@
       "cros_host_sysroot": "//build/linux/debian_sid_amd64-sysroot",
       "cros_v8_snapshot_sysroot": "//build/linux/debian_sid_amd64-sysroot",
       "enable_linux_installer": false,
+      "is_cfi": true,
       "is_chrome_branded": true,
       "is_chromeos_device": true,
       "is_official_build": true,
@@ -260,6 +261,7 @@
       "use_pangocairo": false,
       "use_pulseaudio": false,
       "use_system_libsync": false,
+      "use_thin_lto": true,
       "use_v8_context_snapshot": false,
       "use_vaapi": false
     }

tools/mb/mb_config_expectations/chromium.perf.json

@@ -52,6 +52,7 @@
       "cros_host_sysroot": "//build/linux/debian_sid_amd64-sysroot",
       "cros_v8_snapshot_sysroot": "//build/linux/debian_sid_amd64-sysroot",
       "enable_linux_installer": false,
+      "is_cfi": true,
       "is_chrome_branded": true,
       "is_chromeos_device": true,
       "is_official_build": true,
@@ -72,6 +73,7 @@
       "use_pangocairo": false,
       "use_pulseaudio": false,
       "use_system_libsync": false,
+      "use_thin_lto": true,
       "use_v8_context_snapshot": false,
       "use_vaapi": false
     }

tools/mb/mb_config_expectations/official.chrome.continuous.json

@@ -6,6 +6,7 @@
       "cros_host_sysroot": "//build/linux/debian_sid_amd64-sysroot",
       "cros_v8_snapshot_sysroot": "//build/linux/debian_sid_amd64-sysroot",
       "enable_linux_installer": false,
+      "is_cfi": true,
       "is_chrome_branded": true,
       "is_chromeos_device": true,
       "is_official_build": true,
@@ -26,6 +27,7 @@
       "use_pangocairo": false,
       "use_pulseaudio": false,
       "use_system_libsync": false,
+      "use_thin_lto": true,
       "use_v8_context_snapshot": false,
       "use_vaapi": false
     }

tools/mb/mb_config_expectations/official.chrome.json

@@ -6,6 +6,7 @@
       "cros_host_sysroot": "//build/linux/debian_sid_amd64-sysroot",
       "cros_v8_snapshot_sysroot": "//build/linux/debian_sid_amd64-sysroot",
       "enable_linux_installer": false,
+      "is_cfi": true,
       "is_chrome_branded": true,
       "is_chromeos_device": true,
       "is_official_build": true,
@@ -26,6 +27,7 @@
       "use_pangocairo": false,
       "use_pulseaudio": false,
       "use_system_libsync": false,
+      "use_thin_lto": true,
       "use_v8_context_snapshot": false,
       "use_vaapi": false
     }