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

base/base.gypi

Index: base/base.gypi
diff --git a/base/base.gypi b/base/base.gypi
index 47789debc9d7d12ecf6f1396c9ec531436295e38..74bddf08d7c7c89bbd618b5c84c09df65796e9e7 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -394,6 +394,10 @@
             '../build/util/build_util.gyp:lastchange',
             '../build/linux/system.gyp:gtk',
             '../build/linux/system.gyp:nss',
+            'symbolize'
+          ],
+          'defines': [
+            'USE_SYMBOLIZE',
           ],
           'cflags': [
             '-Wno-write-strings',
@@ -602,5 +606,20 @@
         },
       ],
     }],
+    [ 'OS == "linux" or OS == "freebsd"', {
+      'targets': [
+        {
+          'target_name': 'symbolize',
+          'type': '<(library)',
+          'cflags': [
+            '-Wno-sign-compare',
+          ],
+          'sources': [
+            'third_party/symbolize/symbolize.cc',
+            'third_party/symbolize/demangle.cc',
+          ],
+        },
+      ],
+    }],
   ],
 }