Store log messages in global activity tracker.

base/debug/activity_analyzer.h

Index: base/debug/activity_analyzer.h
diff --git a/base/debug/activity_analyzer.h b/base/debug/activity_analyzer.h
index 0a527332a62d0253b67a203290778349d3fec6ac..01228453ff5fba3a69092fd3d577b1d9aaec78dd 100644
--- a/base/debug/activity_analyzer.h
+++ b/base/debug/activity_analyzer.h
@@ -132,6 +132,9 @@ class BASE_EXPORT GlobalActivityAnalyzer {
   // Ownership stays with the global analyzer object.
   ThreadActivityAnalyzer* GetAnalyzerForThread(const ThreadKey& key);
 
+  // Gets all log messages stored within.
+  std::vector<std::string> GetLogMessages();
+
   // Gets the corresponding "program location" for a given "program counter".
   // This will return {0,0} if no mapping could be found.
   ProgramLocation GetProgramLocationFromAddress(uint64_t address);