Add is_chromecast to GN build.

There are several specific features needed for Chromecast builds. This
flag will be used to enable and disable these features. This flag is
the equivalent of 'embedded' and 'is_chromecast' in GYP, which mean the
same thing in practice.

BUG=516899
Bug:b/17615224

Review URL: https://codereview.chromium.org/1345013002

Cr-Commit-Position: refs/heads/master@{#349961}

1 files changed, 22 insertions, 7 deletions

diff --git a/ui/ozone/ozone.gni b/ui/ozone/ozone.gni
index e0da919..74d7aa2 100644
--- a/ui/ozone/ozone.gni
+++ b/ui/ozone/ozone.gni
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/chromecast_build.gni")
+
 declare_args() {
   # Select platforms automatically. Turn this off for manual control.
   ozone_auto_platforms = true
@@ -13,19 +15,32 @@ declare_args() {
 
   # Enable individual platforms.
   ozone_platform_caca = false
+  ozone_platform_cast = false
   ozone_platform_egltest = false
   ozone_platform_gbm = false
   ozone_platform_ozonex = false
   ozone_platform_test = false
 
   if (ozone_auto_platforms) {
-    # Use test as the default platform.
-    ozone_platform = "test"
+    if (is_chromecast) {
+      # The default platform used at runtime is "cast".
+      ozone_platform = "cast"
+
+      # For desktop Chromecast builds, override the default "cast" platform with
+      # --ozone_platform=egltest
+      ozone_platform_cast = true
+      ozone_platform_egltest = true
+      ozone_platform_ozonex = true
+      ozone_platform_test = true
+    } else {
+      # Use test as the default platform.
+      ozone_platform = "test"
 
-    # Build all platforms whose deps are in install-build-deps.sh.
-    # Only these platforms will be compile tested by buildbots.
-    ozone_platform_gbm = true
-    ozone_platform_test = true
-    ozone_platform_egltest = true
+      # Build all platforms whose deps are in install-build-deps.sh.
+      # Only these platforms will be compile tested by buildbots.
+      ozone_platform_gbm = true
+      ozone_platform_test = true
+      ozone_platform_egltest = true
+    }
   }
 }