Implement basic stack traces on Android and reenable unit tests.

base/third_party/symbolize/symbolize.h

Index: base/third_party/symbolize/symbolize.h
diff --git a/base/third_party/symbolize/symbolize.h b/base/third_party/symbolize/symbolize.h
index 441e5436962f7ddd091dd348809a1b9220187561..12ca40e8c2fbb58856851ac7efb8a8e2f3771be6 100644
--- a/base/third_party/symbolize/symbolize.h
+++ b/base/third_party/symbolize/symbolize.h
@@ -128,6 +128,18 @@ _START_GOOGLE_NAMESPACE_
 // returns false.
 bool Symbolize(void *pc, char *out, int out_size);
 
+// Search for the object file (from /proc/self/maps) that contains
+// the specified pc. If found, copy the file name to "out" and parsed starting
+// address of where the object file is mapped to in memory and return true.
+// Otherwise, return false.
+//
+// If successful, the resulting file name will include the trailing '\0'.
+//
+// NOTE: "start_address" is the value directly from /proc/self/maps and may not
+// be correct for prelinked shared libraries.
+bool FindObjectFileNameContainingPcAndGetStartAddress(
+    void *pc, char *out, int out_size, uint64_t *start_address);
+
 _END_GOOGLE_NAMESPACE_
 
 #endif  // BASE_SYMBOLIZE_H_