Add GPU command buffer sevice and protobuf to GN build

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 49a859ac5e1c54864790f9b82e191e45368dbce8..a0b1e860ec70381e2c8a6c83cf07a44199107acd 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -693,12 +693,6 @@ if (is_win) {
       "-Wl,--gc-sections",
     ]
   }
-
-  if (is_android || is_ios) {
-    common_optimize_on_cflags += [ "-Os" ]
-  } else {
-    common_optimize_on_cflags += [ "-O2" ]
-  }
 }
 
 # Default "optimization on" config. On Windows, this favors size over speed.
@@ -709,6 +703,14 @@ config("optimize") {
     cflags += [
       "/Os",   # favor size over speed.
     ]
+  } else if (is_android || is_ios) {
+    cflags += [
+      "-Os",  # Favor size over speed.
+    ]
+  } else {
+    cflags += [
+      "-O2",
+    ]
   }
 }
 
@@ -746,6 +748,10 @@ config("optimize_max") {
       "/Ot",   # Favor speed over size.
       "/GL",   # Whole program optimization.
     ]
+  } else {
+    cflags += [
+      "-O2",
+    ]
   }
 }