[test] Fix isolating symbolizer for ubsan

Bug: chromium:726584
Change-Id: I1d413b5568e533e4f517c0687716689dd15da70d
Reviewed-on: https://chromium-review.googlesource.com/723459
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48645}

gni/isolate.gni

@@ -106,6 +106,11 @@ template("v8_isolate_run") {
       } else {
         use_external_startup_data = "0"
       }
+      if (is_ubsan_vptr) {
+        ubsan_vptr = "1"
+      } else {
+        ubsan_vptr = "0"
+      }
       if (v8_use_snapshot) {
         use_snapshot = "true"
       } else {
@@ -170,6 +175,8 @@ template("v8_isolate_run") {
         "--config-variable",
         "target_arch=$target_arch",
         "--config-variable",
+        "ubsan_vptr=$ubsan_vptr",
+        "--config-variable",
         "v8_use_external_startup_data=$use_external_startup_data",
         "--config-variable",
         "v8_use_snapshot=$use_snapshot",

gypfiles/isolate.gypi

@@ -81,6 +81,7 @@
         '--config-variable', 'sanitizer_coverage=<(sanitizer_coverage)',
         '--config-variable', 'component=<(component)',
         '--config-variable', 'target_arch=<(target_arch)',
+        '--config-variable', 'ubsan_vptr=0',
         '--config-variable', 'v8_use_external_startup_data=<(v8_use_external_startup_data)',
         '--config-variable', 'v8_use_snapshot=<(v8_use_snapshot)',
       ],

src/base.isolate

@@ -24,7 +24,7 @@
         ],
       },
     }],
-    ['asan==1 or cfi_vptr==1 or msan==1 or tsan==1', {
+    ['asan==1 or cfi_vptr==1 or msan==1 or tsan==1 or ubsan_vptr==1', {
       'variables': {
         'files': [
           '../third_party/llvm-build/Release+Asserts/bin/llvm-symbolizer<(EXECUTABLE_SUFFIX)',
@@ -32,7 +32,7 @@
       },
     }],
     # Workaround for https://code.google.com/p/swarming/issues/detail?id=211
-    ['asan==0 or cfi_vptr==0 or msan==0 or tsan==0', {
+    ['asan==0 or cfi_vptr==0 or msan==0 or tsan==0 or ubsan_vptr==0 ', {
       'variables': {},
     }],
   ],