Output a linker map file for official builds

build/toolchain/linux/BUILD.gn

Index: build/toolchain/linux/BUILD.gn
diff --git a/build/toolchain/linux/BUILD.gn b/build/toolchain/linux/BUILD.gn
index 86cd7dabc6e86d22a266817dfbb3bf0c719f7992..3be5c36bca692d526d0bdba10a3b0c036922aca5 100644
--- a/build/toolchain/linux/BUILD.gn
+++ b/build/toolchain/linux/BUILD.gn
@@ -58,6 +58,9 @@ gcc_toolchain("arm") {
 }
 
 clang_toolchain("clang_x86") {
+  # Output linker map files for binary size analysis.
+  enable_linker_map = true
+
   toolchain_args = {
     current_cpu = "x86"
     current_os = "linux"
@@ -89,6 +92,9 @@ gcc_toolchain("x86") {
   ar = "ar"
   ld = cxx
 
+  # Output linker map files for binary size analysis.
+  enable_linker_map = true
+
   toolchain_args = {
     current_cpu = "x86"
     current_os = "linux"
@@ -97,6 +103,9 @@ gcc_toolchain("x86") {
 }
 
 clang_toolchain("clang_x64") {
+  # Output linker map files for binary size analysis.
+  enable_linker_map = true
+
   toolchain_args = {
     current_cpu = "x64"
     current_os = "linux"
@@ -128,6 +137,9 @@ gcc_toolchain("x64") {
   ar = "ar"
   ld = cxx
 
+  # Output linker map files for binary size analysis.
+  enable_linker_map = true
+
   toolchain_args = {
     current_cpu = "x64"
     current_os = "linux"