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

build/host_jar.gypi

Index: build/host_jar.gypi
diff --git a/build/host_jar.gypi b/build/host_jar.gypi
index 6ccc1bdbad5a7635a6acb867aab474f8dae99966..6731d8778f514827fee0825470b64080586e212b 100644
--- a/build/host_jar.gypi
+++ b/build/host_jar.gypi
@@ -3,7 +3,9 @@
 # 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:
 # {
@@ -64,14 +66,9 @@
       '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)']
           }]
         ],
@@ -93,10 +90,38 @@
         '--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)',
+          ],
+        }
+      ]
+    }]
   ]
 }