Add tool to analyze rate of events.

Bug: 78765090
Change-Id: I7c7845c2b3cab41e4c925938cd07d77c04ac66f5
diff --git a/Android.bp b/Android.bp
index 0579556..59bc206 100644
--- a/Android.bp
+++ b/Android.bp
@@ -36,6 +36,7 @@
     "src/base/string_utils.cc",
     "src/base/temp_file.cc",
     "src/base/thread_checker.cc",
+    "src/base/time.cc",
     "src/base/unix_task_runner.cc",
     "src/base/virtual_destructors.cc",
     "src/base/watchdog_posix.cc",
@@ -148,6 +149,7 @@
     "src/base/string_utils.cc",
     "src/base/temp_file.cc",
     "src/base/thread_checker.cc",
+    "src/base/time.cc",
     "src/base/unix_task_runner.cc",
     "src/base/virtual_destructors.cc",
     "src/base/watchdog_posix.cc",
@@ -276,6 +278,7 @@
     "src/base/test/test_task_runner.cc",
     "src/base/test/vm_test_utils.cc",
     "src/base/thread_checker.cc",
+    "src/base/time.cc",
     "src/base/unix_task_runner.cc",
     "src/base/virtual_destructors.cc",
     "src/base/watchdog_posix.cc",
@@ -3456,6 +3459,7 @@
     "src/base/string_utils.cc",
     "src/base/temp_file.cc",
     "src/base/thread_checker.cc",
+    "src/base/time.cc",
     "src/base/unix_task_runner.cc",
     "src/base/virtual_destructors.cc",
     "src/base/watchdog_posix.cc",
@@ -3636,6 +3640,7 @@
     "src/base/test/vm_test_utils.cc",
     "src/base/thread_checker.cc",
     "src/base/thread_checker_unittest.cc",
+    "src/base/time.cc",
     "src/base/time_unittest.cc",
     "src/base/unix_task_runner.cc",
     "src/base/utils_unittest.cc",