GN(android): Add scripts & runtime logic for installing _managed apks

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index d57ec6e7f9de3aa6eef1e9c12f90de14d583f550..5264f2ac90bc7d3097a1631a63d87d5ba42350bf 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -1441,8 +1441,10 @@
           'target_name': 'base_java',
           'type': 'none',
           'variables': {
-            'java_in_dir': '../base/android/java',
+            'java_in_dir': 'android/java',
             'jar_excluded_classes': [ '*/NativeLibraries.class' ],
+            # TODO(agrieve): Implement new incremental install for GYP.
+            'additional_src_dirs': [ 'android/java/release_src' ],
           },
           'dependencies': [
             'base_java_application_state',