Add the TID to the CallStack.

src/google_breakpad/processor/call_stack.h

Index: src/google_breakpad/processor/call_stack.h
diff --git a/src/google_breakpad/processor/call_stack.h b/src/google_breakpad/processor/call_stack.h
index 21f595e7b2c3a59eaf83fd196d1cdcc6ef57fe28..7c4a06f57ea5fd0007d356c7ff36b8acd82318f7 100644
--- a/src/google_breakpad/processor/call_stack.h
+++ b/src/google_breakpad/processor/call_stack.h
@@ -45,6 +45,7 @@
 #ifndef GOOGLE_BREAKPAD_PROCESSOR_CALL_STACK_H__
 #define GOOGLE_BREAKPAD_PROCESSOR_CALL_STACK_H__
 
+#include <cstdint>
 #include <vector>
 
 namespace google_breakpad {
@@ -61,15 +62,24 @@ class CallStack {
 
   // Resets the CallStack to its initial empty state
   void Clear();
-  
+
   const vector<StackFrame*>* frames() const { return &frames_; }
 
+  // Set the TID associated with this call stack.
+  void set_tid(uint32_t tid) { tid_ = tid; }
+
+  uint32_t tid() { return tid_; }
+
  private:
   // Stackwalker is responsible for building the frames_ vector.
   friend class Stackwalker;
 
   // Storage for pushed frames.
   vector<StackFrame*> frames_;
+
+  // The TID associated with this call stack. Default to 0 if it's not
+  // available.
+  uint32_t tid_;
 };
 
 }  // namespace google_breakpad