Add TP stat for adjusted sampling rate.

Bug: 178467684
Change-Id: I69fd300ea3bb4248d93680456bd258e56ca5bec9

src/trace_processor/storage/stats.h

diff --git a/src/trace_processor/storage/stats.h b/src/trace_processor/storage/stats.h
index 041f8b3..0e7f3eb 100644
--- a/src/trace_processor/storage/stats.h
+++ b/src/trace_processor/storage/stats.h
@@ -143,6 +143,10 @@
       "The target was already profiled by another tracing session, so the "    \
       "profile was not taken. Indexed by target upid."),                       \
   F(heapprofd_non_finalized_profile,    kSingle,  kError,    kTrace,    ""),   \
+  F(heapprofd_sampling_interval_adjusted,                                      \
+      kIndexed, kInfo,    kTrace,                                              \
+      "By how many byes the interval for PID was increased "                   \
+      "by adaptive sampling."),                                                \
   F(metatrace_overruns,                 kSingle,  kError,    kTrace,    ""),   \
   F(packages_list_has_parse_errors,     kSingle,  kError,    kTrace,    ""),   \
   F(packages_list_has_read_errors,      kSingle,  kError,    kTrace,    ""),   \