Fix RecordStackTraceAtStartProfiling test.

Review URL: http://codereview.chromium.org/5598008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5936 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/cctest.status

@@ -42,9 +42,6 @@ test-api/ApplyInterruption: PASS || TIMEOUT
 # when snapshot is on, so I am marking it PASS || FAIL
 test-heap-profiler/HeapSnapshotsDiff: PASS || FAIL
 
-# BUG(3260336): Flaky test. May be timing related.
-test-profile-generator/RecordStackTraceAtStartProfiling: PASS || FAIL
-
 # These tests always fail.  They are here to test test.py.  If
 # they don't fail then test.py has failed.
 test-serialize/TestThatAlwaysFails: FAIL

test/cctest/test-profile-generator.cc

@@ -782,12 +782,16 @@ TEST(RecordStackTraceAtStartProfiling) {
       CpuProfiler::GetProfile(NULL, 0);
   const ProfileTree* topDown = profile->top_down();
   const ProfileNode* current = topDown->root();
+  const_cast<ProfileNode*>(current)->Print(0);
   // The tree should look like this:
   //  (root)
   //   (anonymous function)
   //     a
   //       b
   //         c
+  // There can also be:
+  //           startProfiling
+  // if the sampler managed to get a tick.
   current = PickChild(current, "(anonymous function)");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   current = PickChild(current, "a");
@@ -796,7 +800,12 @@ TEST(RecordStackTraceAtStartProfiling) {
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   current = PickChild(current, "c");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
-  CHECK_EQ(0, current->children()->length());
+  CHECK(current->children()->length() == 0 ||
+        current->children()->length() == 1);
+  if (current->children()->length() == 1) {
+    current = PickChild(current, "startProfiling");
+    CHECK_EQ(0, current->children()->length());
+  }
 }