Set CR_CLANG_REVISION on NaCl builds too

BUG=771191
R=thakis@chromium.org

Change-Id: I7f29c4d0951ee4ec253261a39c2f87640156ef59
Reviewed-on: https://chromium-review.googlesource.com/701643Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506659}

build/config/compiler/BUILD.gn

@@ -107,7 +107,7 @@ declare_args() {
   use_cxx11_on_android = use_cxx11
 }
 
-if (is_clang && !is_nacl) {
+if (is_clang) {
   update_args = [ "--print-revision" ]
   if (llvm_force_head_revision) {
     update_args += [ "--llvm-force-head-revision" ]
@@ -184,6 +184,7 @@ config("compiler") {
 
   configs += [
     # See the definitions below.
+    ":clang_revision",
     ":compiler_cpu_abi",
     ":compiler_codegen",
   ]
@@ -260,14 +261,6 @@ config("compiler") {
     ]
   }
 
-  if (is_clang && !is_nacl) {
-    # This is here so that all files get recompiled after a clang roll and
-    # when turning clang on or off. (defines are passed via the command line,
-    # and build system rebuild things when their commandline changes). Nothing
-    # should ever read this define.
-    defines += [ "CR_CLANG_REVISION=\"$clang_revision\"" ]
-  }
-
   # Non-Mac Posix compiler flags setup.
   # -----------------------------------
   if (is_posix && !(is_mac || is_ios)) {
@@ -906,6 +899,16 @@ config("clang_stackrealign") {
   }
 }
 
+config("clang_revision") {
+  if (is_clang) {
+    # This is here so that all files get recompiled after a clang roll and
+    # when turning clang on or off. (defines are passed via the command line,
+    # and build system rebuild things when their commandline changes). Nothing
+    # should ever read this define.
+    defines = [ "CR_CLANG_REVISION=\"$clang_revision\"" ]
+  }
+}
+
 config("compiler_arm_fpu") {
   if (current_cpu == "arm" && !is_ios && !is_nacl) {
     cflags = [ "-mfpu=$arm_fpu" ]