Add modified time checking to strip_library_for_apk.py

build/android/gyp/strip_library_for_apk.py

Index: build/android/gyp/strip_library_for_apk.py
diff --git a/build/android/gyp/strip_library_for_apk.py b/build/android/gyp/strip_library_for_apk.py
index 503f50dbb8f291538498fd62acd2c2547bb650f7..05eacfe43e2f4b24cd56e18f0139ebe92186073f 100755
--- a/build/android/gyp/strip_library_for_apk.py
+++ b/build/android/gyp/strip_library_for_apk.py
@@ -13,10 +13,12 @@ from util import build_utils
 
 
 def StripLibrary(android_strip, android_strip_args, library_path, output_path):
-  strip_cmd = ([android_strip] +
-               android_strip_args +
-               ['-o', output_path, library_path])
-  build_utils.CheckCallDie(strip_cmd)
+  if build_utils.IsTimeStale(output_path, [library_path]):
+    strip_cmd = ([android_strip] +
+                 android_strip_args +
+                 ['-o', output_path, library_path])
+    build_utils.CheckCallDie(strip_cmd)
+
 
 
 def main(argv):