GN: Add depfile for java_cpp_enum

BUG=558194

Review URL: https://codereview.chromium.org/1451223004

Cr-Commit-Position: refs/heads/master@{#360527}

build/android/gyp/java_cpp_enum.py

@@ -306,6 +306,7 @@ def AssertFilesList(output_paths, assert_files_list):
 def DoMain(argv):
   usage = 'usage: %prog [options] [output_dir] input_file(s)...'
   parser = optparse.OptionParser(usage=usage)
+  build_utils.AddDepfileOption(parser)
 
   parser.add_option('--assert_file', action="append", default=[],
                     dest="assert_files_list", help='Assert that the given '
@@ -320,6 +321,22 @@ def DoMain(argv):
                     action='store_true')
 
   options, args = parser.parse_args(argv)
+
+  if options.srcjar:
+    if not args:
+      parser.error('Need to specify at least one input file')
+    input_paths = args
+  else:
+    if len(args) < 2:
+      parser.error(
+          'Need to specify output directory and at least one input file')
+    output_dir = args[0]
+    input_paths = args[1:]
+
+  if options.depfile:
+    python_deps = build_utils.GetPythonDependencies()
+    build_utils.WriteDepfile(options.depfile, input_paths + python_deps)
+
   if options.srcjar:
     if options.print_output_only:
       parser.error('--print_output_only does not work with --srcjar')
@@ -327,17 +344,12 @@ def DoMain(argv):
       parser.error('--assert_file does not work with --srcjar')
 
     with zipfile.ZipFile(options.srcjar, 'w', zipfile.ZIP_STORED) as srcjar:
-      for output_path, data in DoGenerate(args):
+      for output_path, data in DoGenerate(input_paths):
         srcjar.writestr(build_utils.CreateHermeticZipInfo(output_path), data)
   else:
     # TODO(agrieve): Delete this non-srcjar branch once GYP is gone.
-    if len(args) < 2:
-      parser.error(
-          'Need to specify output directory and at least one input file')
-
-    output_dir = args[0]
     output_paths = []
-    for output_path, data in DoGenerate(args[1:]):
+    for output_path, data in DoGenerate(input_paths):
       full_path = os.path.join(output_dir, output_path)
       output_paths.append(full_path)
       if not options.print_output_only:

build/config/android/rules.gni

@@ -348,13 +348,19 @@ template("java_cpp_enum") {
                            ])
 
     script = "//build/android/gyp/java_cpp_enum.py"
+    depfile = "$target_gen_dir/$target_name.d"
 
     _srcjar_path = "${target_gen_dir}/${target_name}.srcjar"
     _rebased_srcjar_path = rebase_path(_srcjar_path, root_build_dir)
     _rebased_sources = rebase_path(invoker.sources, root_build_dir)
 
-    args = [ "--srcjar=$_rebased_srcjar_path" ] + _rebased_sources
+    args = [
+             "--depfile",
+             rebase_path(depfile, root_build_dir),
+             "--srcjar=$_rebased_srcjar_path",
+           ] + _rebased_sources
     outputs = [
+      depfile,
       _srcjar_path,
     ]
   }