Fix selenium to detect and handle browser crashes.

tools/testing/dart/test_runner.dart

Index: tools/testing/dart/test_runner.dart
===================================================================
--- tools/testing/dart/test_runner.dart	(revision 17449)
+++ tools/testing/dart/test_runner.dart	(working copy)
@@ -27,6 +27,8 @@
 const int NO_TIMEOUT = 0;
 const int SLOW_TIMEOUT_MULTIPLIER = 4;
 
+const int CRASHING_BROWSER_EXITCODE = -10;
+
 typedef void TestCaseEvent(TestCase testCase);
 typedef void ExitCodeEvent(int exitCode);
 typedef void EnqueueMoreWork(ProcessQueue queue);
@@ -566,6 +568,11 @@
       if (exitCode == 3) {
         return !timedOut;
       }
+      // TODO(ricow): Remove this dirty hack ones we have a selenium
+      // replacement.
+      if (exitCode == CRASHING_BROWSER_EXITCODE) {
+        return !timedOut;
+      }
       return (!timedOut && (exitCode < 0) && ((0x3FFFFF00 & exitCode) == 0));
     }
     return !timedOut && ((exitCode < 0));
@@ -1274,7 +1281,7 @@
 
     var outcome = _status.split(" ")[2];
     var exitCode = 0;
-    if (outcome == "CRASH") exitCode = -10;
+    if (outcome == "CRASH") exitCode = CRASHING_BROWSER_EXITCODE;
     if (outcome == "FAIL" || outcome == "TIMEOUT") exitCode = 1;
     new CommandOutput.fromCase(_currentTest,
                                _command,