android: Pass (non-generated) .java files via a gyp filelist to javac.py

build/java.gypi

Index: build/java.gypi
diff --git a/build/java.gypi b/build/java.gypi
index 67ff12c0805626c39e3a62396786263789c41229..a68d6535a9ef8d3ea54f880c6ef40a86354c12f7 100644
--- a/build/java.gypi
+++ b/build/java.gypi
@@ -280,16 +280,12 @@
       'action_name': 'javac_<(_target_name)',
       'message': 'Compiling <(_target_name) java sources',
       'variables': {
-        'all_src_dirs': [
-          '>(java_in_dir)/src',
-          '>@(additional_src_dirs)',
-          '>@(generated_src_dirs)',
-        ],
+        'java_source_list': '>|(javasources.<(_target_name).gypcmd >!@(find >(java_in_dir)/src >(additional_src_dirs) -name "*.java"))',
       },
       'inputs': [
         '<(DEPTH)/build/android/gyp/util/build_utils.py',
         '<(DEPTH)/build/android/gyp/javac.py',
-        '>!@(find >(java_in_dir)/src >(additional_src_dirs) -name "*.java")',
+        '>(java_source_list)',
         '>@(input_jars_paths)',
         '>@(additional_input_paths)',
       ],
@@ -300,7 +296,8 @@
         'python', '<(DEPTH)/build/android/gyp/javac.py',
         '--output-dir=<(classes_dir)',
         '--classpath=>(input_jars_paths)',
-        '--src-dirs=>(all_src_dirs)',
+        '--src-filelist=>(java_source_list)',
+        '--src-gendirs=>(generated_src_dirs)',
         '--javac-includes=<(javac_includes)',
         '--chromium-code=<(chromium_code)',
         '--stamp=<(compile_stamp)',