Import google-glog's Symbolize() and use it in debug_util_posix.cc.

base/debug_util_unittest.cc

Index: base/debug_util_unittest.cc
diff --git a/base/debug_util_unittest.cc b/base/debug_util_unittest.cc
index 7bee4ccbc576403b80373d1c558568134710d465..6d3043f83c555f2b1dc8b090b356f555d47a60ec 100644
--- a/base/debug_util_unittest.cc
+++ b/base/debug_util_unittest.cc
@@ -91,3 +91,18 @@ TEST(StackTrace, DISABLED_OutputToStream) {
 
 #endif  // define(OS_MACOSX)
 }
+
+// The test is used for manual testing (i.e. see the raw output).
+// To run the test use the flags:
+// --gtest_filter='*DebugOutputToStream' --gtest_also_run_disabled_tests
+TEST(StackTrace, DISABLED_DebugOutputToStream) {
+  StackTrace trace;
+  std::ostringstream os;
+  trace.OutputToStream(&os);
+  LOG(INFO) << os.str();
+}
+
+// The test is used for manual testing. See the comment above.
+TEST(StackTrace, DISABLED_DebugPrintBacktrace) {
+  StackTrace().PrintBacktrace();
+}