Clean up stale java in explicit bindings generator gypi

third_party/mojo/mojom_bindings_generator_explicit.gypi

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     'mojom_bindings_generator_variables.gypi',
   ],
   'variables': {
     'mojom_base_output_dir':
         '<!(python <(DEPTH)/build/inverse_depth.py <(DEPTH))',
     'mojom_generated_outputs': [
       '<!@(python <(DEPTH)/third_party/mojo/src/mojo/public/tools/bindings/mojom_list_outputs.py --basedir <(mojom_base_output_dir) <@(mojom_files))',
     ],
   },
   # Given mojom files as inputs, generate sources.  These sources will be
   # exported to another target (via dependent_settings) to be compiled.  This
   # keeps code generation separate from compilation, allowing the same sources
   # to be compiled with multiple toolchains - target, NaCl, etc.
   'actions': [
     {
+      'variables': {
+        'java_out_dir': '<(PRODUCT_DIR)/java_mojo/<(_target_name)/src',
+        'stamp_filename': '<(PRODUCT_DIR)/java_mojo/<(_target_name)/<(_target_name).stamp',
+      },
+      'action_name': '<(_target_name)_mojom_bindings_stamp',
+      # The java output directory is deleted to ensure that the java library
+      # doesn't try to compile stale files.
+      'action': [
+        'python', '<(DEPTH)/build/rmdir_and_stamp.py',
+        '<(java_out_dir)',
+        '<(stamp_filename)',
+      ],
+      'inputs': [ '<@(mojom_files)' ],
+      'outputs': [ '<(stamp_filename)' ],
+    },
+    {
       'action_name': '<(_target_name)_mojom_bindings_generator',
       'variables': {
         'java_out_dir': '<(PRODUCT_DIR)/java_mojo/<(_target_name)/src',
+        'stamp_filename': '<(PRODUCT_DIR)/java_mojo/<(_target_name)/<(_target_name).stamp',
         'mojom_import_args%': [
          '-I<(DEPTH)',
          '-I<(DEPTH)/third_party/mojo/src'
         ],
       },
       'inputs': [
         '<@(mojom_bindings_generator_sources)',
         '<@(mojom_files)',
+        '<(stamp_filename)',
       ],
       'outputs': [
         '<@(mojom_generated_outputs)',
       ],
       'action': [
         'python', '<@(mojom_bindings_generator)',
         '<@(mojom_files)',
         '--use_bundled_pylibs',
         '-d', '<(DEPTH)',
         '<@(mojom_import_args)',
@@ skipping 29 matching lines @@
       'include_dirs': [
         '<(DEPTH)',
         '<(DEPTH)/third_party/mojo/src',
         '<(SHARED_INTERMEDIATE_DIR)',
         '<(SHARED_INTERMEDIATE_DIR)/third_party/mojo/src',
       ],
       'variables': {
         'generated_src_dirs': [
           '<(PRODUCT_DIR)/java_mojo/<(_target_name)/src',
         ],
+        'additional_input_paths': [
+          '<@(mojom_bindings_generator_sources)',
+          '<@(mojom_files)',
+        ],
       },
     }
   },
 }