Add new GN junit binary template and new GYP java binary template.

build/host_jar.gypi

 # Copyright 2014 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.
 
 # This file is meant to be included into a target to provide a rule to build
-# a JAR file for use on a host in a consistent manner.
+# a JAR file for use on a host in a consistent manner. If a main class is
+# specified, this file will also generate an executable to run the jar in the
+# output folder's /bin/ directory.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my_jar',
 #   'type': 'none',
 #   'variables': {
 #     'src_paths': [
 #       'path/to/directory',
 #       'path/to/other/directory',
 #       'path/to/individual_file.java',
@@ skipping 40 matching lines @@
       'input_jars_paths': ['<(jar_path)']
     },
   },
   'actions': [
     {
       'action_name': 'javac_<(_target_name)',
       'message': 'Compiling <(_target_name) java sources',
       'variables': {
         'extra_options': [],
         'java_sources': [ '<!@(find <@(src_paths) -name "*.java")' ],
+        'java_sources!': ['<!@(find <@(excluded_src_paths) -name "*.java")'],

[cjhopman, 2015/04/06 18:56:32]

if excluded_src_paths is empty, this will do the wrong thing. Even if something
somewhere else guarantees that it isn't empty, I'd move it back into the
conditions (or at least comment about that guarantee.

[mikecase (-- gone --), 2015/04/06 21:03:39]

Done, but I kept 2 changes I made to the condition statements. 

1) --excluded-classes should be --jar-excluded-classes
2) '">(main_class)" != ""' was always returning true no matter what. Changed to
'main_class != ""' which fixed the problem.

         'conditions': [
-          ['"<(excluded_src_paths)" != ""', {
-            'java_sources!': ['<!@(find <@(excluded_src_paths) -name "*.java")']
-          }],
-          ['"<(jar_excluded_classes)" != ""', {
-            'extra_options': ['--excluded-classes=<(jar_excluded_classes)']
-          }],
-          ['">(main_class)" != ""', {
+          ['main_class != ""', {
             'extra_options': ['--main-class=>(main_class)']
           }]
         ],
       },
       'inputs': [
         '<(DEPTH)/build/android/gyp/util/build_utils.py',
         '<(DEPTH)/build/android/gyp/javac.py',
         '^@(java_sources)',
         '>@(input_jars_paths)',
       ],
       'outputs': [
         '<(jar_path)',
         '<(stamp)',
       ],
       'action': [
         'python', '<(DEPTH)/build/android/gyp/javac.py',
         '--classpath=>(input_jars_paths)',
         '--src-gendirs=>(generated_src_dirs)',
         '--chromium-code=<(chromium_code)',
         '--stamp=<(stamp)',
         '--jar-path=<(jar_path)',
+        '--jar-excluded-classes=<(jar_excluded_classes)',
         '<@(extra_options)',
         '^@(java_sources)',
       ],
     },
+  ],
+  'conditions': [
+    ['main_class != ""', {
+      'actions': [
+        {
+          'action_name': 'create_java_binary_script_<(_target_name)',
+          'message': 'Creating java binary script <(_target_name)',
+          'variables': {
+            'output': '<(PRODUCT_DIR)/bin/<(_target_name)',
+          },
+          'inputs': [
+            '<(DEPTH)/build/android/gyp/create_java_binary_script.py',
+            '<(jar_path)',
+          ],
+          'outputs': [
+            '<(output)',
+          ],
+          'action': [
+            'python', '<(DEPTH)/build/android/gyp/create_java_binary_script.py',
+            '--classpath=>(input_jars_paths)',
+            '--jar-path=<(jar_path)',
+            '--output=<(output)',
+            '--main-class=>(main_class)',
+          ],
+        }
+      ]
+    }]
   ]
 }