Enable Control Flow Integrity for the official Linux Chrome.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 63fce9c159fed5c89a2e80578a02ed527f3c022d..a8302ba9d640a32dee388855a1c1c61af28ccdb8 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -847,6 +847,13 @@
           'enable_prod_wallet_service%': 1,
         }],
 
+        # Enable Control Flow Integrity for the official Linux Chrome.
+        # This triggers an LTO build that requires LLVM Gold plugin to be
+        # downloaded. See src/tools/clang/scripts/update.sh
+        ['OS=="linux" and target_arch=="x64" and buildtype=="Official" and branding=="Chrome" and chromeos==0', {
+          'cfi_vptr%': 1,
+        }],
+
         # Enable hotwording on Chrome-branded ChromeOS builds.
         ['branding=="Chrome" and chromeos==1', {
           'enable_hotwording%': 1,