💥 Fail compile if dx has input paths which do not end with .jar

build/android/gyp/dex.py

Index: build/android/gyp/dex.py
diff --git a/build/android/gyp/dex.py b/build/android/gyp/dex.py
index ccb00c12dc3c0e87373b1fcb4f9776c96914899c..36f87f06569dfeab33c2b58cb9017e51df3a4ee3 100755
--- a/build/android/gyp/dex.py
+++ b/build/android/gyp/dex.py
@@ -15,6 +15,17 @@ import zipfile
 from util import build_utils
 
 
+def _CheckFilePathEndsWithJar(parser, file_path):
+  if not file_path.endswith(".jar"):
+    # dx ignores non .jar files.
+    parser.error("%s does not end in .jar" % file_path)
+
+
+def _CheckFilePathsEndWithJar(parser, file_paths):
+  for file_path in file_paths:
+    _CheckFilePathEndsWithJar(parser, file_path)
+
+
 def _RemoveUnwantedFilesFromZip(dex_path):
   iz = zipfile.ZipFile(dex_path, 'r')
   tmp_dex_path = '%s.tmp.zip' % dex_path
@@ -81,9 +92,14 @@ def _ParseArgs(args):
 
   if options.inputs:
     options.inputs = build_utils.ParseGypList(options.inputs)
+    _CheckFilePathsEndWithJar(parser, options.inputs)
   if options.excluded_paths:
     options.excluded_paths = build_utils.ParseGypList(options.excluded_paths)
 
+  if options.proguard_enabled_input_path:
+    _CheckFilePathEndsWithJar(parser, options.proguard_enabled_input_path)
+  _CheckFilePathsEndWithJar(parser, paths)
+
   return options, paths