Workaround ARM tracing issues for non-component builds.

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 aeb2fe3c6658ee489c2a90d326daae039bb87415..bc871de444ae2d43f2df8a9fbd81591e034ba4e2 100644
--- a/base/third_party/symbolize/symbolize.h
+++ b/base/third_party/symbolize/symbolize.h
@@ -138,6 +138,23 @@ typedef int (*SymbolizeOpenObjectFileCallback)(uint64_t pc,
 void InstallSymbolizeOpenObjectFileCallback(
     SymbolizeOpenObjectFileCallback callback);
 
+// Parsed /proc/maps entry; used by FindMappedRegion() below.
+struct MappedRegion {
+  uint64_t start_address;
+  uint64_t end_address;
+  const char* flags;
+  uint64_t file_offset;
+  const char* name;
+};
+
+// Iteratively parses /proc/self/maps and calls |callback| for each entry
+// until it returns 'true'.
+// Returns 'true' itself only if iteration was stopped by the callback.
+// The function is async-signal-safe.
+bool FindMappedRegion(
+    void* callback_data,
+    bool (*callback)(void* data, const MappedRegion& region));
+
 _END_GOOGLE_NAMESPACE_
 
 #endif