[Android] Insert chromium version string into native libraries.

When building the native libraries, insert the version string into
native libraries as a section .chromium.verson.

BUG=417510

Review URL: https://codereview.chromium.org/599093005

Cr-Commit-Position: refs/heads/master@{#297065}

build/android/gyp/insert_chromium_version.py

+#!/usr/bin/env python
+#
+# 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.
+
+"""Insert a version string into a library as a section '.chromium.version'.
+"""
+
+import optparse
+import os
+import sys
+import tempfile
+
+from util import build_utils
+
+def InsertChromiumVersion(android_objcopy,
+                          library_path,
+                          version_string):
+  # Remove existing .chromium.version section from .so
+  objcopy_command = [android_objcopy,
+                     '--remove-section=.chromium.version',
+                     library_path]
+  build_utils.CheckOutput(objcopy_command)
+
+  # Add a .chromium.version section.
+  with tempfile.NamedTemporaryFile() as stream:
+    stream.write(version_string)
+    stream.flush()
+    objcopy_command = [android_objcopy,
+                       '--add-section', '.chromium.version=%s' % stream.name,
+                       library_path]
+    build_utils.CheckOutput(objcopy_command)
+
+def main(args):
+  args = build_utils.ExpandFileArgs(args)
+  parser = optparse.OptionParser()
+
+  parser.add_option('--android-objcopy',
+      help='Path to the toolchain\'s objcopy binary')
+  parser.add_option('--libraries-source-dir',
+      help='Directory of native libraries')
+  parser.add_option('--libraries',
+      help='List of libraries')
+  parser.add_option('--version-string',
+      help='Version string to be inserted')
+  parser.add_option('--stamp', help='Path to touch on success')
+
+  options, _ = parser.parse_args(args)
+  libraries = build_utils.ParseGypList(options.libraries)
+
+  for library in libraries:
+    library_path = os.path.join(options.libraries_source_dir, library)
+
+    InsertChromiumVersion(options.android_objcopy,
+                          library_path,
+                          options.version_string)
+
+  if options.stamp:
+    build_utils.Touch(options.stamp)
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))

build/android/insert_chromium_version.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.
+
+# This file is meant to be included into an action to provide a rule that
+# inserts a chromium version string into native libraries.
+#
+# To use this, create a gyp target with the following form:
+#  {
+#    'action_name': 'insert_chromium_version',
+#    'actions': [
+#      'variables': {
+#        'ordered_libraries_file': 'file generated by write_ordered_libraries'
+#        'libraries_source_dir': 'the directory contains native libraries'
+#        'input_paths': 'files to be added to the list of inputs'
+#        'stamp': 'file to touch when the action is complete'
+#        'version_string': 'chromium version string to be inserted'
+#      'includes': [ '../../build/android/insert_chromium_version.gypi' ],
+#    ],
+#  },
+#
+
+{
+  'message': 'Inserting chromium version string into native libraries',
+  'variables': {
+    'input_paths': [],
+  },
+  'inputs': [
+    '<(DEPTH)/build/android/gyp/util/build_utils.py',
+    '<(DEPTH)/build/android/gyp/insert_chromium_version.py',
+    '<(ordered_libraries_file)',
+    '>@(input_paths)',
+  ],
+  'outputs': [
+    '<(stamp)',
+  ],
+  'action': [
+    'python', '<(DEPTH)/build/android/gyp/insert_chromium_version.py',
+    '--android-objcopy=<(android_objcopy)',
+    '--libraries-source-dir=<(libraries_source_dir)',
+    '--libraries=@FileArg(<(ordered_libraries_file):libraries)',
+    '--version-string=<(version_string)',
+    '--stamp=<(stamp)',
+  ],
+  'conditions': [
+    ['component == "shared_library"', {
+      # Add a fake output to force the build to always re-run this step. This
+      # is required because the real inputs are not known at gyp-time and
+      # changing base.so may not trigger changes to dependent libraries.
+      'outputs': [ '<(stamp).fake' ]
+    }],
+  ],
+}

build/java_apk.gypi

@@ -110,6 +110,7 @@
     'strip_stamp': '<(intermediate_dir)/strip.stamp',
     'stripped_libraries_dir': '<(intermediate_dir)/stripped_libraries',
     'strip_additional_stamp': '<(intermediate_dir)/strip_additional.stamp',
+    'version_stamp': '<(intermediate_dir)/version.stamp',
     'javac_includes': [],
     'jar_excluded_classes': [],
     'javac_jar_path': '<(intermediate_dir)/<(_target_name).javac.jar',
@@ -363,6 +364,19 @@
           },
           'includes': ['../build/android/pack_arm_relocations.gypi'],
         },
+        {
+          'action_name': 'insert_chromium_version',
+          'variables': {
+            'ordered_libraries_file%': '<(ordered_libraries_file)',
+            'libraries_source_dir%': '<(libraries_source_dir)',
+            'version_string': '<(native_lib_version_name)',
+            'input_paths': [
+              '<(pack_arm_relocations_stamp)',
+            ],
+            'stamp': '<(version_stamp)'
+          },
+          'includes': ['../build/android/insert_chromium_version.gypi'],
+        },
         {
           'variables': {
             'input_libraries': [
@@ -461,8 +475,8 @@
                   'variables': {
                     'inputs': [
                       '<(ordered_libraries_file)',
-                      '<(pack_arm_relocations_stamp)',
                       '<(strip_additional_stamp)',
+                      '<(version_stamp)',
                     ],
                     'input_apk_path': '<(unsigned_apk_path)',
                     'output_apk_path': '<(unsigned_standalone_apk_path)',
@@ -478,8 +492,8 @@
           'variables': {
             'libraries_source_dir': '<(apk_package_native_libs_dir)/<(android_app_abi)',
             'package_input_paths': [
-              '<(pack_arm_relocations_stamp)',
               '<(strip_additional_stamp)',
+              '<(version_stamp)',
             ],
           },
         }],