Generate Cronet Version.java based on VERSION and LASTCHANGE files.

components/cronet.gypi

 # Copyright 2014 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.
 
 {
   'conditions': [
     ['OS=="android" and use_icu_alternatives_on_android==1', {
       # TODO(mef): Figure out what needs to be done for gn script.
       'targets': [
         {
@@ skipping 38 matching lines @@
           'sources': [
             'cronet/android/java/src/org/chromium/net/UrlRequestContextConfig.template',
           ],
           'variables': {
             'package_name': 'org/chromium/cronet',
             'template_deps': ['cronet/url_request_context_config_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
         {
+          'target_name': 'cronet_version',
+          'type': 'none',
+          # Because cronet_version generates a header, we must set the
+          # hard_dependency flag.
+          'hard_dependency': 1,
+          'actions': [
+            {
+              'action_name': 'cronet_version',
+              'variables': {
+                'lastchange_path': '<(DEPTH)/build/util/LASTCHANGE',
+                'version_py_path': '<(DEPTH)/build/util/version.py',
+                'version_path': '<(DEPTH)/chrome/VERSION',
+                'template_input_path': 'cronet/cronet_version.h.version',
+              },
+              'inputs': [
+                '<(template_input_path)',
+                '<(version_path)',
+                '<(lastchange_path)',
+              ],
+              'outputs': [
+                '<(SHARED_INTERMEDIATE_DIR)/cronet/cronet_version.h',
+              ],
+              'action': [
+                'python',
+                '<(version_py_path)',
+                '-f', '<(version_path)',
+                '-f', '<(lastchange_path)',
+                '<(template_input_path)',
+                '<@(_outputs)',
+              ],
+              'message': 'Generating version information',
+            },
+          ],
+        },
+        {
           'target_name': 'libcronet',
           'type': 'shared_library',
           'dependencies': [
             '../base/base.gyp:base',
             '../base/base.gyp:base_i18n',
             '../third_party/icu/icu.gyp:icui18n',
             '../third_party/icu/icu.gyp:icuuc',
             '../url/url.gyp:url_lib',
             'cronet_jni_headers',
             'cronet_url_request_context_config_list',
             'cronet_url_request_error_list',
             'cronet_url_request_priority_list',
+            'cronet_version',
             '../net/net.gyp:net',
           ],
           'sources': [
             'cronet/url_request_context_config.cc',
             'cronet/url_request_context_config.h',
             'cronet/url_request_context_config_list.h',
             'cronet/android/cronet_jni.cc',
             'cronet/android/org_chromium_net_UrlRequest.cc',
             'cronet/android/org_chromium_net_UrlRequest.h',
             'cronet/android/org_chromium_net_UrlRequest_error_list.h',
             'cronet/android/org_chromium_net_UrlRequest_priority_list.h',
             'cronet/android/org_chromium_net_UrlRequestContext.cc',
             'cronet/android/org_chromium_net_UrlRequestContext.h',
             'cronet/android/org_chromium_net_UrlRequestContext_config_list.h',
             'cronet/android/url_request_context_peer.cc',
             'cronet/android/url_request_context_peer.h',
             'cronet/android/url_request_peer.cc',
             'cronet/android/url_request_peer.h',
           ],
           'cflags': [
-            # TODO(mef): Figure out a good way to get version from chrome_version_info_posix.h.
-            '-DCHROMIUM_VERSION=\\"TBD\\"',
             '-DLOGGING=1',
             '-fdata-sections',
             '-ffunction-sections',
             '-fno-rtti',
             '-fvisibility=hidden',
             '-fvisibility-inlines-hidden',
             '-Wno-sign-promo',
             '-Wno-missing-field-initializers',
           ],
           'ldflags': [
@@ skipping 163 matching lines @@
             'java_in_dir': 'cronet/android/sample/javatests',
             'resource_dir': 'cronet/android/sample/res',
             'is_test_apk': 1,
           },
           'includes': [ '../build/java_apk.gypi' ],
         },
       ],
     }],  # OS=="android"
   ],
 }