Check for use_x11 before runnig desktop_capture_modules_tests on linux.

webrtc/modules/desktop_capture/BUILD.gn

Index: webrtc/modules/desktop_capture/BUILD.gn
diff --git a/webrtc/modules/desktop_capture/BUILD.gn b/webrtc/modules/desktop_capture/BUILD.gn
index bbf9ac57bbb6a7516f73ffae543cf468d54e59a0..6e7e9bcf3971c946b4383a23db01848ae35678ae 100644
--- a/webrtc/modules/desktop_capture/BUILD.gn
+++ b/webrtc/modules/desktop_capture/BUILD.gn
@@ -57,39 +57,37 @@ if (rtc_include_tests) {
 
   rtc_source_set("desktop_capture_unittests") {
     testonly = true
-    sources = []
-    deps = []
-    if (rtc_desktop_capture_supported || is_android) {
-      deps += [
-        ":desktop_capture",
-        ":primitives",
-        "../..:webrtc_common",
-        "../../base:rtc_base_approved",
-        "../../system_wrappers:system_wrappers",
-        "../../test:test_support",
-        "//testing/gmock",
-      ]
-      sources += [
-        "desktop_region_unittest.cc",
-        "differ_block_unittest.cc",
-      ]
-    }
+    sources = [
+      "desktop_and_cursor_composer_unittest.cc",
+      "desktop_capturer_differ_wrapper_unittest.cc",
+      "desktop_frame_rotation_unittest.cc",
+      "desktop_region_unittest.cc",
+      "differ_block_unittest.cc",
+      "mouse_cursor_monitor_unittest.cc",
+      "rgba_color_unittest.cc",
+      "test_utils.cc",
+      "test_utils.h",
+      "test_utils_unittest.cc",
+      "win/cursor_unittest.cc",
+      "win/cursor_unittest_resources.h",
+      "win/cursor_unittest_resources.rc",
+    ]
+    deps = [
+      ":desktop_capture",
+      ":desktop_capture_mock",
+      ":primitives",
+      ":rgba_color",
+      "../..:webrtc_common",
+      "../../base:rtc_base_approved",
+      "../../system_wrappers:system_wrappers",
+      "../../test:test_support",
+      "//testing/gmock",
+    ]
     if (rtc_desktop_capture_supported) {
       sources += [
-        "desktop_and_cursor_composer_unittest.cc",
-        "desktop_capturer_differ_wrapper_unittest.cc",
-        "desktop_frame_rotation_unittest.cc",
-        "mouse_cursor_monitor_unittest.cc",
-        "rgba_color_unittest.cc",
         "screen_capturer_helper_unittest.cc",
         "screen_capturer_mac_unittest.cc",
         "screen_capturer_unittest.cc",
-        "test_utils.cc",
-        "test_utils.h",
-        "test_utils_unittest.cc",
-        "win/cursor_unittest.cc",
-        "win/cursor_unittest_resources.h",
-        "win/cursor_unittest_resources.rc",
         "window_capturer_unittest.cc",
       ]
       deps += [ ":desktop_capture_mock" ]