Componentize VersionInfo.

components/version_info.gypi

+# Copyright 2015 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': {
+    # Some plaform want to override part of the version number generation
+    # (for example iOS uses a different value for PATCH level for canary).
+    # This can be done settings "extra_version_path" variable to the path
+    # of a file with the corresponding value overrides. If present it will
+    # be loaded after all other input files.
+    'extra_version_name': '',
+  },
+  'targets': [
+    {
+      # GN version: //components/version_info
+      'target_name': 'version_info',
+      'type': 'static_library',
+      'include_dirs': [
+        '..',
+      ],
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../ui/base/ui_base.gyp:ui_base',
+        'components_strings.gyp:components_strings',
+        'generate_version_info',
+      ],
+      'sources': [
+        'version_info/version_info.cc',
+        'version_info/version_info.h',
+      ],
+    },
+    {
+      # GN version: //components/version_info:generate_version
+      'target_name': 'generate_version_info',
+      'type': 'none',
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '<(SHARED_INTERMEDIATE_DIR)',
+        ],
+      },
+      # Because generate_version_info generates a header, the target must set
+      # the hard_dependency flag.
+      'hard_dependency': 1,
+      'actions': [
+        {
+          'action_name': 'generation_version_info',
+          'message': 'Generating version information',
+          'variables': {
+            'extra_version_flags': [],
+            'lastchange_path': '../build/util/LASTCHANGE',
+            'version_py_path': '../build/util/version.py',
+            'template_input_path': 'version_info/version_info_values.h.version',
+            # Use VERSION and BRANDING files from //chrome even if this is bad
+            # dependency until they are moved to src/ for VERSION and to the
+            # version_info component for BRANDING. Synchronisation with TPM and
+            # all release script is required for thoses moves. They are tracked
+            # by issues http://crbug.com/512347 and http://crbug.com/513603.
+            'version_path': '../chrome/VERSION',
+            'branding_path': '../chrome/app/theme/<(branding_path_component)/BRANDING',
+          },
+          'inputs': [
+            '<(version_py_path)',
+            '<(template_input_path)',
+            '<(version_path)',
+            '<(branding_path)',
+            '<(lastchange_path)',
+          ],
+          'outputs': [
+            '<(SHARED_INTERMEDIATE_DIR)/components/version_info/version_info_values.h',
+          ],
+          'action': [
+            'python',
+            '<(version_py_path)',
+            '-f', '<(version_path)',
+            '-f', '<(branding_path)',
+            '-f', '<(lastchange_path)',
+            '<@(extra_version_flags)',
+            '<(template_input_path)',
+            '<@(_outputs)',
+          ],
+          'conditions': [
+            ['extra_version_name!=""', {
+              'variables': {
+                'extra_version_flags': [
+                  '-f', '<(extra_version_name)',
+                ],
+              },
+              'inputs': [
+                '<(extra_version_name)'
+              ],
+            }],
+          ],
+        },
+      ],
+    },
+  ],
+  'conditions': [
+    ['OS=="ios"', {
+      'variables': {
+        # Controls whether the extra version path should be overridden to
+        # use ios/build/util/CANARY_VERSION (legacy until the bots have
+        # been updated to override ios_extra_version_path instead).
+        # TODO(sdefresne): remove once http://crbug.com/514560 is fixed.
+        'use_canary_version_file%': 0,
+
+        # Path to the file used to override the version PATH level on iOS.
+        # Default to ios/build/util/VERSION.
+        'ios_extra_version_path%': '../ios/build/util/VERSION',
+      },
+      'conditions': [
+        ['use_canary_version_file==1', {
+          'variables': {
+            'extra_version_name': '../ios/build/util/CANARY_VERSION',
+          },
+        }, {
+          'variables': {
+            'extra_version_name': '<(ios_extra_version_path)',
+          },
+        }],
+      ],
+    }],
+  ],
+}