Only compile ozone_platform_headless for headless.gn.

build/args/headless.gn

Index: build/args/headless.gn
diff --git a/build/args/headless.gn b/build/args/headless.gn
index 29260e342cc61cfefb2fc727ab23f1b2462de69b..8054d39e4de796ad339060390c23293400d41035 100644
--- a/build/args/headless.gn
+++ b/build/args/headless.gn
@@ -8,6 +8,9 @@
 # Use gn args to add your own build preference args.
 
 use_ozone = true
+ozone_auto_platforms = false
+ozone_platform = "headless"
+ozone_platform_headless = true

[Dirk Pranke, 2016/04/11 21:47:07]

why do we need both lines 12 and 13? That seems kinda redundant ...

[kylechar, 2016/04/11 22:34:43]

The first one tells Ozone to use the headless platform at runtime if no platform
is specified via --ozone-platform=<platform>. The second one says to compile
headless so it's available at runtime.

I think Ozone just grabs the first available platform in the list if
ozone_platform and --ozone-platform=<platform> are both omitted, so its
technically not necessary, but if someone were to add other platforms to this
config it would ensure headless is what gets selected by default.

 
 enable_basic_printing = false
 enable_print_preview = false