Linux sandbox: support build configuration without base test framework

sandbox/linux/sandbox_linux.gypi

Index: sandbox/linux/sandbox_linux.gypi
diff --git a/sandbox/linux/sandbox_linux.gypi b/sandbox/linux/sandbox_linux.gypi
index 77242235f8e3c19660723098fd9d20ce6b49cf97..e09ba39ad032ce86c4b95383e4025b038ffefeca 100644
--- a/sandbox/linux/sandbox_linux.gypi
+++ b/sandbox/linux/sandbox_linux.gypi
@@ -8,9 +8,11 @@
       ['OS=="linux"', {
         'compile_suid_client': 1,
         'compile_credentials': 1,
+        'use_base_test_suite': 1,
       }, {
         'compile_suid_client': 0,
         'compile_credentials': 0,
+        'use_base_test_suite': 0,
       }],
       ['OS=="linux" and (target_arch=="ia32" or target_arch=="x64" or '
          'target_arch=="mipsel")', {
@@ -88,6 +90,14 @@
             'seccomp_bpf',
           ]
         }],
+        [ 'use_base_test_suite==1', {
+          'dependencies': [
+            '../base/base.gyp:test_support_base',
+          ],
+          'defines': [
+            'SANDBOX_USES_BASE_TEST_SUITE',
+          ],
+        }],
       ],
     },
     {