Generate ChromeVersionConstants.java at build time.

chrome/chrome_android.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.
 {
   'variables': {
     'chromium_code': 1,
     'conditions': [
       ['component != "shared_library" and target_arch != "arm64" and target_arch != "x64" and profiling_full_stack_frames != 1', {
         # Only enable the chromium linker on regular builds, since the
         # component build crashes on Android 4.4. See b/11379966
@@ skipping 33 matching lines @@
         'app/chrome_main_delegate.cc',
         'app/chrome_main_delegate.h',
       ],
       'link_settings': {
         'libraries': [
           '-landroid',
           '-ljnigraphics',
         ],
       },
     },
+    {
+      'target_name': 'chrome_version_java',
+      'type': 'none',
+      'variables': {
+        'template_input_path': 'android/java/ChromeVersionConstants.java.version',
+        'version_path': 'VERSION',
+        'version_py_path': '<(DEPTH)/build/util/version.py',
+        'output_path': '<(SHARED_INTERMEDIATE_DIR)/templates/<(_target_name)/org/chromium/chrome/browser/ChromeVersionConstants.java',
+
+        'conditions': [
+          ['branding == "Chrome"', {
+            'branding_path': 'app/theme/google_chrome/BRANDING',
+          }, {
+            'branding_path': 'app/theme/chromium/BRANDING',
+          }],
+        ],
+      },
+      'direct_dependent_settings': {
+        'variables': {
+          # Ensure that the output directory is used in the class path
+          # when building targets that depend on this one.
+          'generated_src_dirs': [
+            '<(SHARED_INTERMEDIATE_DIR)/templates/<(_target_name)',
+          ],
+          # Ensure dependents are rebuilt when the generated Java file changes.
+          'additional_input_paths': [
+            '<(output_path)',
+          ],
+        },
+      },
+      'actions': [
+        {
+          'action_name': 'chrome_version_java_template',
+          'inputs': [
+            '<(template_input_path)',
+            '<(version_path)',
+            '<(branding_path)',
+            '<(version_py_path)',
+          ],
+          'outputs': [
+            '<(output_path)',
+          ],
+          'action': [
+            'python',
+            '<(version_py_path)',
+            '-f', '<(version_path)',
+            '-f', '<(branding_path)',
+            '<(template_input_path)',
+            '<(output_path)',
+          ],
+        },
+      ],
+    },
   ],
 }