Revert of Revert of [Android] JUnit runner + gyp changes. (patchset #1 id:1 of https://codereview.chromium.org/597123002/)

Reason for revert:
Didn't help. We probably got scheduled on other, flakier Android devices which caused tests to start flaking, or something else is the root cause.

Original issue's description:
> Revert of [Android] JUnit runner + gyp changes. (patchset #15 id:280001 of https://codereview.chromium.org/574433003/)
>
> Reason for revert:
> Speculative revert: Android test started flaking a ton after this landed. Affected targets androidwebview_instrumentation_tests, chromeshell_instrumentation_tests, contentshell_instrumentation_tests. This CL seems the most likely in the blamelist of https://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/15905.
>
> Original issue's description:
> > [Android] JUnit runner + gyp changes.
> >
> > This adds Java code for running junit tests, as well as gyp targets for
> > both runnable and non-runnable host-side JARs.
> >
> > BUG=316383
> >
> > Committed: https://crrev.com/2e56d4508e33de5fc60bbbb41c5a5d5534e88174
> > Cr-Commit-Position: refs/heads/master@{#296340}
>
> TBR=cjhopman@chromium.org,nyquist@chromium.org,aurimas@chromium.org,jbudorick@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=316383
>
> Committed: https://crrev.com/54b9408f8b18e3bf3a33343e375186e1949e8e86
> Cr-Commit-Position: refs/heads/master@{#296384}

TBR=cjhopman@chromium.org,nyquist@chromium.org,aurimas@chromium.org,jbudorick@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=316383

Review URL: https://codereview.chromium.org/596303002

Cr-Commit-Position: refs/heads/master@{#296406}

1 files changed, 102 insertions, 0 deletions

diff --git a/build/host_jar.gypi b/build/host_jar.gypi
new file mode 100644
index 0000000..6ccc1bd
--- /dev/null
+++ b/build/host_jar.gypi
@@ -0,0 +1,102 @@
+# 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.
+#
+# 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',
+#       ...
+#     ],
+#   },
+#   'includes': [ 'path/to/this/gypi/file' ],
+# }
+#
+# Required variables:
+#   src_paths - A list of all paths containing java files that should be
+#     included in the jar. Paths can be either directories or files.
+# Optional/automatic variables:
+#   excluded_src_paths - A list of all paths that should be excluded from
+#     the jar.
+#   generated_src_dirs - Directories containing additional .java files
+#     generated at build time.
+#   input_jars_paths - A list of paths to the jars that should be included
+#     in the classpath.
+#   main_class - The class containing the main() function that should be called
+#     when running the jar file.
+#   jar_excluded_classes - A list of .class files that should be excluded
+#     from the jar.
+
+{
+  'dependencies': [
+    '<(DEPTH)/build/android/setup.gyp:build_output_dirs',
+  ],
+  'variables': {
+    'classes_dir': '<(intermediate_dir)/classes',
+    'excluded_src_paths': [],
+    'generated_src_dirs': [],
+    'input_jars_paths': [],
+    'intermediate_dir': '<(SHARED_INTERMEDIATE_DIR)/<(_target_name)',
+    'jar_dir': '<(PRODUCT_DIR)/lib.java',
+    'jar_excluded_classes': [],
+    'jar_name': '<(_target_name).jar',
+    'jar_path': '<(jar_dir)/<(jar_name)',
+    'main_class%': '',
+    'stamp': '<(intermediate_dir)/jar.stamp',
+  },
+  'all_dependent_settings': {
+    'variables': {
+      '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")' ],
+        'conditions': [
+          ['"<(excluded_src_paths)" != ""', {
+            'java_sources!': ['<!@(find <@(excluded_src_paths) -name "*.java")']
+          }],
+          ['"<(jar_excluded_classes)" != ""', {
+            'extra_options': ['--excluded-classes=<(jar_excluded_classes)']
+          }],
+          ['">(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)',
+        '<@(extra_options)',
+        '^@(java_sources)',
+      ],
+    },
+  ]
+}
+