[Android] Allow Java libraries to access resources from dependencies.

build/java.gypi

Index: build/java.gypi
diff --git a/build/java.gypi b/build/java.gypi
index 1ab72c20b7f706d81981e8885fbf0ae258a984e4..7a4b7a3348a50619188a798de171e61e1c2670f0 100644
--- a/build/java.gypi
+++ b/build/java.gypi
@@ -88,6 +88,7 @@
         'R_stamp': '<(intermediate_dir)/resources.stamp',
         'generated_src_dirs': ['<(R_dir)'],
         'additional_input_paths': ['<(R_stamp)'],
+        'additional_res_dirs': [],
       },
       'all_dependent_settings': {
         'variables': {
@@ -133,6 +134,18 @@
           'message': 'processing resources for <(_target_name)',
           'variables': {
             'android_manifest': '<(DEPTH)/build/android/AndroidManifest.xml',
+            'all_res_dirs': ['<@(res_input_dirs)'],
+            # Work around a gyp bug where late-expanding an empty list results
+            # in one element -- an empty string -- instead of zero elements.
+            # TODO(newt): Remove this condition once
+            # https://code.google.com/p/gyp/issues/detail?id=328 is fixed.

[cjhopman, 2013/03/27 00:37:50]

Could this bug be due to the fact that all_res_dirs is early expanded below?

+            'conditions': [
+              ['additional_res_dirs!=[]', {
+                # Include the depedencies' res dirs so that references to
+                # resources in dependencies can be resolved.
+                'all_res_dirs': ['>@(additional_res_dirs)'],
+              }],
+            ],
           },
           'inputs': [
             '<(DEPTH)/build/android/pylib/build_utils.py',
@@ -147,7 +160,7 @@
             '--android-sdk', '<(android_sdk)',
             '--android-sdk-tools', '<(android_sdk_tools)',
             '--R-dir', '<(R_dir)',
-            '--res-dirs', '<(res_input_dirs)',
+            '--res-dirs', '<(all_res_dirs)',
             '--crunch-input-dir', '>(res_dir)',
             '--crunch-output-dir', '<(res_crunched_dir)',
             '--android-manifest', '<(android_manifest)',