Support Java resources within content and chrome

build/java.gypi

Index: build/java.gypi
diff --git a/build/java.gypi b/build/java.gypi
index e4342063e9be3977e8d3a0e1776854e56f4db64a..215b562ba5f8d1e94866a49f24708f4ebbc8f64b 100644
--- a/build/java.gypi
+++ b/build/java.gypi
@@ -38,6 +38,12 @@
 #    empty, which leads to inclusion of all files specified. May include
 #    wildcard, and supports '**/' for recursive path wildcards, ie.:
 #    '**/MyFileRegardlessOfDirectory.java', '**/IncludedPrefix*.java'.
+#  has_java_resources - Set to 1 if the java target contains an
+#    Android-compatible resources folder named res.  If 1, R_package and
+#    R_package_relpath must also be set.
+#  R_package - The java package in which the R class (which maps resources to
+#    integer IDs) should be generated, e.g. org.chromium.content.
+#  R_package_relpath - Same as R_package, but replace each '.' with '/'.
 
 {
   'dependencies': [
@@ -53,10 +59,67 @@
   'variables': {
     'input_jars_paths': [],
     'additional_src_dirs': [],
-    'additional_input_paths': [],
-    'generated_src_dirs': [],
     'javac_includes': [],
+    'additional_input_paths': ['>@(additional_R_files)'],
+    'generated_src_dirs': ['>@(generated_R_dirs)'],
+    'generated_R_dirs': [],
+    'additional_R_files': [],
+    'has_java_resources%': 0,
   },
+  'conditions': [
+    ['has_java_resources == 1', {
+      'variables': {
+        'R_dir': '<(SHARED_INTERMEDIATE_DIR)/<(package_name)/java_R',
+        'R_file': '<(R_dir)/<(R_package_relpath)/R.java',
+        'generated_src_dirs': ['<(R_dir)'],
+        'additional_input_paths': ['<(R_file)'],
+      },
+      'all_dependent_settings': {
+        'variables': {
+          # Dependent jars include this target's R.java file via
+          # generated_R_dirs and additional_R_files.
+          'generated_R_dirs': ['<(R_dir)'],
+          'additional_R_files': ['<(R_file)'],
+
+          # Dependent APKs include this target's resources via
+          # additional_res_dirs and additional_res_packages.
+          'additional_res_dirs': ['<(java_in_dir)/res'],
+          'additional_res_packages': ['<(R_package)'],
+        },
+      },
+      'actions': [
+        # Generate R.java for the library.  This R.java contains non-final
+        # constants and is used only while compiling the library jar (e.g.
+        # chromium_content.jar).  When building an apk, a new R.java file with
+        # the correct resource -> ID mappings will be generated by merging the
+        # resources from all libraries and the main apk project.
+        {
+          'action_name': 'generate_r_java',
+          'message': 'generating R.java for <(package_name)',
+          'inputs': [
+            '<(android_sdk_tools)/aapt',
+            '<(android_sdk)/android.jar',
+            '<(DEPTH)/build/android/AndroidManifest.xml',
+            '<!@(find <(java_in_dir)/res -type f)',
+          ],
+          'outputs': [
+            '<(R_file)',
+          ],
+          'action': [
+            '<(android_sdk_tools)/aapt',
+            'package',
+            '-m',
+            '--non-constant-id',
+            '--custom-package', '<(R_package)',
+            '-M', '<(DEPTH)/build/android/AndroidManifest.xml',
+            '-S', '<(java_in_dir)/res',
+            '-I', '<(android_sdk)/android.jar',
+            '-J', '<(R_dir)',
+          ],
+        },
+      ],
+    }],
+  ],
   'actions': [
     {
       'action_name': 'ant_<(package_name)',