Re-committing http://codereview.chromium.org/6803005/ after fixing multi-dll build:

third_party/libphonenumber/libphonenumber.gyp

+# Copyright (c) 2011 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': {
+    'protoc_out_dir': '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
+  },
+  'target_defaults': {
+    'include_dirs': [
+      '../..',  # add it first, so src/base headers are used instead of the ones
+                # brought with the library as cc files would be taken from the
+                # main chrome tree as well.
+      'cpp/src',
+      '<(protoc_out_dir)',
+      '../protobuf/src',
+      '../icu/public/common',
+      '../icu/public/i18n',
+    ],
+    'defines': [
+      'U_USING_ICU_NAMESPACE=0',
+    ],
+    'conditions': [
+      ['OS!="win" or component=="static_library"', {
+        'defines': [
+          'U_STATIC_IMPLEMENTATION',
+        ],
+      }],
+    ],
+  },
+  'targets': [{
+    'target_name': 'libphonenumber',
+    'type': '<(library)',
+    'dependencies': [
+      '../icu/icu.gyp:icui18n',
+      '../icu/icu.gyp:icuuc',
+      '../protobuf/protobuf.gyp:protobuf_lite',
+      '../../base/base.gyp:base',
+      '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
+      'phonenumber_proto',
+    ],
+    'sources': [
+      'chrome/regexp_adapter_icuregexp.cc',
+      'cpp/src/default_logger.cc',
+      'cpp/src/logger_adapter.cc',
+      'cpp/src/metadata.cc',
+      'cpp/src/phonenumber.cc',
+      'cpp/src/phonenumberutil.cc',
+      'cpp/src/stringutil.cc',
+      'cpp/src/utf/rune.c',
+      'cpp/src/utf/unicodetext.cc',
+      'cpp/src/utf/unilib.cc',
+      # Generated by phonenumber_proto.
+      '<(protoc_out_dir)/phonemetadata.pb.cc',
+      '<(protoc_out_dir)/phonenumber.pb.cc',
+    ],
+    'conditions': [
+      ['OS=="win"', {
+        'action': [
+          '/wo4309',
+        ],
+      }],
+    ],
+  },
+  {
+    # Protobuf compiler / generate rule for the phones
+    'target_name': 'phonenumber_proto',
+    'type': 'none',
+    'sources': [
+      'resources/phonemetadata.proto',
+      'resources/phonenumber.proto',
+    ],
+    'rules': [{
+      'rule_name': 'genproto',
+      'extension': 'proto',
+      'inputs': [
+        '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)protoc<(EXECUTABLE_SUFFIX)',
+      ],
+      'variables': {
+        # The protoc compiler requires a proto_path argument with the
+        # directory containing the .proto file.
+        # There's no generator variable that corresponds to this, so fake it.
+        'rule_input_relpath': 'resources',
+      },
+      'outputs': [
+        '<(protoc_out_dir)/<(RULE_INPUT_ROOT).pb.h',
+        '<(protoc_out_dir)/<(RULE_INPUT_ROOT).pb.cc',
+      ],
+      'action': [
+        '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)protoc<(EXECUTABLE_SUFFIX)',
+        '--proto_path=<(rule_input_relpath)',
+        '<(rule_input_relpath)/<(RULE_INPUT_ROOT)<(RULE_INPUT_EXT)',
+        '--cpp_out=<(protoc_out_dir)',
+      ],
+      'message': 'Generating C++ code from <(RULE_INPUT_PATH)',
+    }],
+    'dependencies': [
+      '../protobuf/protobuf.gyp:protobuf_lite',
+      '../protobuf/protobuf.gyp:protoc#host',
+    ],
+    'direct_dependent_settings': {
+      'include_dirs': [
+        '<(protoc_out_dir)',
+      ]
+    },
+    'export_dependent_settings': [
+      '../../third_party/protobuf/protobuf.gyp:protobuf_lite',
+    ],
+  },
+  {
+    'target_name': 'libphonenumber_unittests',
+    'type': 'executable',
+    'sources': [
+      '../../base/test/run_all_unittests.cc',
+      'cpp/src/phonenumberutil_test.cc',
+      'cpp/src/regexp_adapter_unittest.cc',
+      'cpp/src/stringutil_test.cc',
+      'cpp/src/test_metadata.cc',
+    ],
+    'dependencies': [
+      '../icu/icu.gyp:icui18n',
+      '../icu/icu.gyp:icuuc',
+      '../protobuf/protobuf.gyp:protobuf_lite',
+      '../../base/base.gyp:base',
+      '../../base/base.gyp:test_support_base',
+      '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
+      '../../testing/gmock.gyp:gmock',
+      '../../testing/gtest.gyp:gtest',
+      'libphonenumber',
+    ],
+    'conditions': [
+      ['OS=="win"', {
+        'action': [
+          '/wo4309',
+        ],
+      }],
+    ],
+  }]
+}