Support profiler stack sampling in any situation.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index 1066e34f7626da733c9fa957e3a7fbf180a3f66e..d238f9bece7dc6eda5cc993b1b7111080c1b270f 100644
--- a/src/log.h
+++ b/src/log.h
@@ -270,7 +270,7 @@ class Logger {
 };
 
 
-// Class that extracts stack trace, used for profiling
+// Class that extracts stack trace, used for profiling.
 class StackTracer BASE_EMBEDDED {
  public:
   explicit StackTracer(unsigned int low_stack_bound)