Add a few tests to ProfilerEventsProcessor.

test/cctest/test-profile-generator.cc

Index: test/cctest/test-profile-generator.cc
diff --git a/test/cctest/test-profile-generator.cc b/test/cctest/test-profile-generator.cc
index fc4d603e61020cae6cb437521744ca5626a951c3..b63dd1267871c4a955b9670f324332466150e459 100644
--- a/test/cctest/test-profile-generator.cc
+++ b/test/cctest/test-profile-generator.cc
@@ -412,9 +412,9 @@ TEST(RecordTickSample) {
   ProfileNode* node2 = top_down_test_helper.Walk(entry1, entry1);
   CHECK_NE(NULL, node2);
   CHECK_EQ(entry1, node2->entry());
-  // ProfileNode* node3 = top_down_test_helper.Walk(entry1, entry2, entry3);
-  // CHECK_NE(NULL, node3);
-  // CHECK_EQ(entry2, node3->entry());
+  ProfileNode* node3 = top_down_test_helper.Walk(entry1, entry2, entry3);
+  CHECK_NE(NULL, node3);
+  CHECK_EQ(entry3, node3->entry());
   ProfileNode* node4 = top_down_test_helper.Walk(entry1, entry3, entry1);
   CHECK_NE(NULL, node4);
   CHECK_EQ(entry1, node4->entry());