Time the internal steps of packaging.

Change-Id: I228d58bd6607ec6fe8d6e101b7e3ab7347c77e9f

1 files changed, 25 insertions, 0 deletions

diff --git a/build/lib/build_support.py b/build/lib/build_support.py
index 6d7beb9f6..3b48826de 100644
--- a/build/lib/build_support.py
+++ b/build/lib/build_support.py
@@ -14,12 +14,14 @@
 # limitations under the License.
 #
 import argparse
+import datetime
 import multiprocessing
 import os
 import shutil
 import subprocess
 import sys
 import tempfile
+import timeit
 import zipfile
 
 
@@ -69,6 +71,29 @@ ALL_ABIS = (
 )
 
 
+class Timer(object):
+    def __init__(self):
+        self.start_time = None
+        self.end_time = None
+        self.duration = None
+
+    def start(self):
+        self.start_time = timeit.default_timer()
+
+    def finish(self):
+        self.end_time = timeit.default_timer()
+
+        # Not interested in partial seconds at this scale.
+        seconds = int(self.end_time - self.start_time)
+        self.duration = datetime.timedelta(seconds=seconds)
+
+    def __enter__(self):
+        self.start()
+
+    def __exit__(self, _exc_type, _exc_value, _traceback):
+        self.finish()
+
+
 def arch_to_toolchain(arch):
     return dict(zip(ALL_ARCHITECTURES, ALL_TOOLCHAINS))[arch]