Add modified time checking to strip_library_for_apk.py

build/android/gyp/util/build_utils.py

Index: build/android/gyp/util/build_utils.py
diff --git a/build/android/gyp/util/build_utils.py b/build/android/gyp/util/build_utils.py
index bdfa28aa8a5cd9c9f18d46c03060ab46361913e6..1fac120658f9ee621fecbad02bce8733d5a109f6 100644
--- a/build/android/gyp/util/build_utils.py
+++ b/build/android/gyp/util/build_utils.py
@@ -101,3 +101,19 @@ def CheckCallDie(args, suppress_output=False, cwd=None):
       print stdout,
     return stdout
 
+
+def GetModifiedTime(path):
+  # For a symlink, the modified time should be the greater of the link's
+  # modified time and the modified time of the target.
+  return max(os.lstat(path).st_mtime, os.stat(path).st_mtime)
+
+
+def IsTimeStale(output, inputs):
+  if not os.path.exists(output):
+    return True
+
+  output_time = GetModifiedTime(output)
+  for input in inputs:
+    if GetModifiedTime(input) > output_time:
+      return True
+  return False