Run gn check for an android build on presubmit

mojo/edk/embedder/BUILD.gn

Index: mojo/edk/embedder/BUILD.gn
diff --git a/mojo/edk/embedder/BUILD.gn b/mojo/edk/embedder/BUILD.gn
index 3d808d82ef62373f0e23c671a179b32699fc5ded..d9a6e69f1e7653944e37043dc5442a21b3b9548b 100644
--- a/mojo/edk/embedder/BUILD.gn
+++ b/mojo/edk/embedder/BUILD.gn
@@ -38,9 +38,7 @@ mojo_edk_source_set("embedder") {
     ":platform",
   ]
 
-  mojo_sdk_public_deps = [
-    "mojo/public/cpp/system",
-  ]
+  mojo_sdk_public_deps = [ "mojo/public/cpp/system" ]
 
   deps = [
     "//base",
@@ -50,13 +48,9 @@ mojo_edk_source_set("embedder") {
 mojo_edk_source_set("platform") {
   # This isn't really a standalone target; it must be linked into the
   # mojo_system_impl component.
-  visibility = [
-    ":embedder",
-  ]
+  visibility = [ ":embedder" ]
 
-  mojo_edk_visibility = [
-    "mojo/edk/system",
-  ]
+  mojo_edk_visibility = [ "mojo/edk/system" ]
 
   sources = [
     "platform_channel_pair.cc",
@@ -90,6 +84,10 @@ mojo_edk_source_set("platform") {
   deps = [
     "//base",
   ]
+
+  if (is_android) {
+    deps += [ "//third_party/ashmem" ]
+  }
 }
 
 mojo_edk_source_set("embedder_unittests") {