icecc support for cros host build

build/toolchain/cros/BUILD.gn

Index: build/toolchain/cros/BUILD.gn
diff --git a/build/toolchain/cros/BUILD.gn b/build/toolchain/cros/BUILD.gn
index bf139dc12da8192f02bd1e7c83e18c3a77f795a5..6e6de7645c63677c6761daf942bb7c87412ca264 100644
--- a/build/toolchain/cros/BUILD.gn
+++ b/build/toolchain/cros/BUILD.gn
@@ -9,9 +9,14 @@ import("//build/toolchain/cros_toolchain.gni")
 
 # This is the normal toolchain for most targets.
 gcc_toolchain("target") {
+  if (cc_wrapper != "") {
+    compiler_prefix = cc_wrapper + " "
+  } else {
+    compiler_prefix = ""
+  }
   ar = cros_target_ar
-  cc = cros_target_cc
-  cxx = cros_target_cxx
+  cc = compiler_prefix + cros_target_cc
+  cxx = compiler_prefix + cros_target_cxx

[dshwang, 2016/09/06 15:00:12]

exclude target build, because for some reason, iceccd doesn't dispatch
target-build-jobs to clients
/bin/sh -c icecc x86_64-cros-linux-gnu-g++ XXXXX

   ld = cxx
   if (cros_target_ld != "") {
     ld = cros_target_ld
@@ -73,10 +78,16 @@ gcc_toolchain("nacl_bootstrap") {
 }
 
 gcc_toolchain("host") {
+  if (cc_wrapper != "") {
+    compiler_prefix = cc_wrapper + " "
+  } else {
+    compiler_prefix = ""
+  }
+
   # These are args for the template.
   ar = cros_host_ar
-  cc = cros_host_cc
-  cxx = cros_host_cxx
+  cc = compiler_prefix + cros_host_cc
+  cxx = compiler_prefix + cros_host_cxx
   ld = cxx
   if (cros_host_ld != "") {
     ld = cros_host_ld