logd: add android::sizesTotal() function

Test: gTest liblog-unit-tests, logd-unit-tests and logcat-unit-tests
Bug: 31456426
Change-Id: I6fb6cd589227fc43d22f9336e01f1bf7e3feb24c
diff --git a/logd/LogStatistics.h b/logd/LogStatistics.h
index 8bf655b..613771c 100644
--- a/logd/LogStatistics.h
+++ b/logd/LogStatistics.h
@@ -472,6 +472,7 @@
     size_t mDroppedElements[LOG_ID_MAX];
     size_t mSizesTotal[LOG_ID_MAX];
     size_t mElementsTotal[LOG_ID_MAX];
+    static size_t SizesTotal;
     bool enable;
 
     // uid to size list
@@ -554,6 +555,7 @@
     }
     size_t sizesTotal(log_id_t id) const { return mSizesTotal[id]; }
     size_t elementsTotal(log_id_t id) const { return mElementsTotal[id]; }
+    static size_t sizesTotal() { return SizesTotal; }
 
     std::string format(uid_t uid, pid_t pid, unsigned int logMask) const;