Add support for Java nano protocol buffers for Android.

build/protoc_java.gypi

 # Copyright (c) 2012 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 invoke protoc in a consistent manner. This is only to be included
 # for Java targets. When including this file, a .jar-file will be generated.
 # For other targets, see protoc.gypi.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my_proto_lib',
 #   'sources': [
 #     'foo.proto',
 #     'bar.proto',
 #   ],
 #   'variables': {
 #     'proto_in_dir': '.'
 #   },
 #   'includes': ['path/to/this/gypi/file'],
 # }
 #
 # The 'proto_in_dir' variable must be the relative path to the
 # directory containing the .proto files.  If left out, it defaults to '.'.
 #
+# You can optionally set a variable 'proto_runtime' to either 'lite' or 'nano'.
+# The default runtime is 'lite'.
+#
 # The 'output_java_files' variable specifies a list of output files that will
 # be generated. It is based on the package and java_outer_classname fields in
 # the proto. All the values must be prefixed with >(java_out_dir), since that
 # is the root directory of all the output.
 #
 # Implementation notes:
 # A target_name of foo and proto-specified 'package' java.package.path produces:
 #   <(PRODUCT_DIR)/java_proto/foo/{java/package/path/}{Foo,Bar}.java
 # where Foo and Bar are taken from 'java_outer_classname' of the protos.
 #
 # How the .jar-file is created is different than how protoc is used for other
 # targets, and as such, this lives in its own file.
 
 {
   'variables': {
-    'protoc': '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)protoc<(EXECUTABLE_SUFFIX)',
+    'proto_runtime%': 'lite',
     'java_out_dir': '<(PRODUCT_DIR)/java_proto/<(_target_name)/src',
     'proto_in_dir%': '.',
     'stamp_file': '<(java_out_dir).stamp',
     'script': '<(DEPTH)/build/protoc_java.py',
 
     # The rest of the variables here are for the java.gypi include.
     'java_in_dir': '<(DEPTH)/build/android/empty',
     'generated_src_dirs': ['<(java_out_dir)'],
     # Adding the |stamp_file| to |additional_input_paths| makes the actions in
     # the include of java.gypi depend on the genproto_java action.
     'additional_input_paths': ['<(stamp_file)'],
   },
   'actions': [
     {
       'action_name': 'genproto_java',
       'inputs': [
         '<(script)',
         '<(protoc)',
         '<@(_sources)',
       ],
       # We do not know the names of the generated files, so we use a stamp.
       'outputs': [
         '<(stamp_file)',
       ],
       'action': [
         '<(script)',
         '<(protoc)',
         '<(proto_in_dir)',
         '<(java_out_dir)',
+        '<(proto_runtime)',
         '<(stamp_file)',
         '<@(_sources)',
       ],
-      'message': 'Generating Java code from <(proto_in_dir)',
+      'message': 'Generating <(proto_runtime) Java code from protobuf files in <(proto_in_dir)',
     },
   ],
-  'dependencies': [
-    '<(DEPTH)/third_party/protobuf/protobuf.gyp:protoc#host',
-    '<(DEPTH)/third_party/protobuf/protobuf.gyp:protobuf_lite_javalib',
+  'conditions': [
+    ['proto_runtime=="lite"', {
+      'variables': {
+        'protoc': '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)protoc<(EXECUTABLE_SUFFIX)',
+      },
+      'dependencies': [
+        '<(DEPTH)/third_party/protobuf/protobuf.gyp:protoc#host',
+        '<(DEPTH)/third_party/protobuf/protobuf.gyp:protobuf_lite_javalib',
+      ],
+    }],
+    ['proto_runtime=="nano"', {
+      'variables': {
+        'protoc': '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)android_protoc<(EXECUTABLE_SUFFIX)',
+      },
+      'dependencies': [
+        '<(DEPTH)/third_party/android_protobuf/android_protobuf.gyp:android_protoc#host',
+        '<(DEPTH)/third_party/android_protobuf/android_protobuf.gyp:protobuf_nano_javalib',
+      ],
+    }],
   ],
   'includes': [ 'java.gypi' ],
 }