Add junit tests for //base/android

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index 325210f4af2f702adee32e37b90cd746e21f66a3..f358d2088951d9ba4cd210afeacf768a4b50cd73 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -1509,6 +1509,23 @@
           'includes': [ '../build/java.gypi' ],
         },
         {
+          # GN: //base:base_junit_tests
+          'target_name': 'base_junit_tests',
+          'type': 'none',
+          'dependencies': [
+            'base_java',
+            'base_java_test_support',
+            '../testing/android/junit/junit_test.gyp:junit_test_support',
+          ],
+          'variables': {
+             'main_class': 'org.chromium.testing.local.JunitTestMain',
+             'src_paths': [
+               '../base/android/junit/',
+             ],
+           },
+          'includes': [ '../build/host_jar.gypi' ],
+        },
+        {
           # GN: //base:base_javatests
           'target_name': 'base_javatests',
           'type': 'none',