Update CRD ChromeOS Host build files to be better in line with GN style.

remoting/host/linux/BUILD.gn

Index: remoting/host/linux/BUILD.gn
diff --git a/remoting/host/linux/BUILD.gn b/remoting/host/linux/BUILD.gn
index 0745dc5e5fdccb0837297ffb37c017da9d2b313c..2ecb970d31204dd15a6cff086e132dd5c51b05e4 100644
--- a/remoting/host/linux/BUILD.gn
+++ b/remoting/host/linux/BUILD.gn
@@ -53,14 +53,26 @@ source_set("linux") {
     "//remoting/protocol",
     "//third_party/webrtc/modules/desktop_capture",
   ]
+  public_deps = []
 
   if (use_x11) {
     deps += [ ":x11" ]
   }
+  if (is_desktop_linux) {
+    if (use_gtk3) {
+      public_deps += [ "//build/config/linux/gtk3" ]
+    } else {
+      public_deps += [ "//build/config/linux/gtk2" ]
+    }
+  }
 }
 
 source_set("x11") {
   sources = [
+    "x11_character_injector.cc",
+    "x11_character_injector.h",
+    "x11_keyboard_impl.cc",
+    "x11_keyboard_impl.h",
     "x11_util.cc",
     "x11_util.h",
     "x_server_clipboard.cc",
@@ -96,3 +108,39 @@ target("executable", "remoting_native_messaging_host") {
       [ "VERSION=" + "$chrome_version_major" + "." + "$remoting_version_patch" +
         "." + "$chrome_version_build" + "." + "$chrome_version_patch" ]
 }
+
+source_set("unit_tests") {
+  testonly = true
+
+  sources = [
+    "audio_pipe_reader_unittest.cc",
+    "certificate_watcher_unittest.cc",
+    "unicode_to_keysym_unittest.cc",
+    "x11_character_injector_unittest.cc",
+    "x_server_clipboard_unittest.cc",
+  ]
+
+  if (!use_x11) {
+    sources -= [ "unicode_to_keysym_unittest.cc" ]
+  }
+
+  configs += [ "//remoting/build/config:version" ]
+
+  deps = [
+    "//remoting/host",
+    "//remoting/host:test_support",
+    "//remoting/host/it2me:common",
+    "//remoting/host/native_messaging",
+    "//remoting/host/security_key:unit_tests",
+    "//remoting/host/setup",
+    "//remoting/proto",
+    "//remoting/resources",
+    "//skia",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+
+  if (enable_configuration_policy) {
+    deps += [ "//components/policy/core/browser:test_support" ]
+  }
+}