Add goma=on option to Makefile build.

rmcilroy · Commit bot · commit 91255190eacc · 2015-07-09T09:50:59.000Z
Review URL: https://codereview.chromium.org/1225683010 Cr-Commit-Position: refs/heads/master@{#29551}
diff --git a/Makefile b/Makefile
@@ -162,7 +162,9 @@ endif
 ifdef embedscript
   GYPFLAGS += -Dembed_script=$(embedscript)
 endif
-
+ifeq ($(goma), on)
+  GYPFLAGS += -Duse_goma=1
+endif
 # arm specific flags.
 # arm_version=<number | "default">
 ifneq ($(strip $(arm_version)),)
