Provide dummy Android UI thread with looper for C++ unit tests

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index f724b32f77551660fecfcbc4cb6026ed3ea9c7b7..56e32b503cbf3fa771534cdae23d090c5f7954f0 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -990,6 +990,8 @@
         'test/test_switches.h',
         'test/test_timeouts.cc',
         'test/test_timeouts.h',
+        'test/test_ui_thread_android.cc',
+        'test/test_ui_thread_android.h',
         'test/thread_test_helper.cc',
         'test/thread_test_helper.h',
         'test/trace_event_analyzer.cc',
@@ -1391,6 +1393,7 @@
           'type': 'none',
           'sources': [
             'test/android/java/src/org/chromium/base/ContentUriTestUtils.java',
+            'test/android/java/src/org/chromium/base/TestUiThread.java',
           ],
           'variables': {
             'jni_gen_package': 'base',