ui/platform_window: Introduce PlatformWindow for windowing primitives.

ui/platform_window/platform_window.gyp

Index: ui/platform_window/platform_window.gyp
diff --git a/ui/platform_window/platform_window.gyp b/ui/platform_window/platform_window.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..15162bfdf4560a18f3dbdfb9bdbd130bf42273e0
--- /dev/null
+++ b/ui/platform_window/platform_window.gyp
@@ -0,0 +1,19 @@
+# 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.
+
+{
+  'variables': {
+    'chromium_code': 1,
+  },
+  'targets': [{
+    'target_name': 'platform_window',
+    'type': '<(component)',
+    'defines': [ 'PLATFORM_WINDOW_IMPLEMENTATION' ],
+    'sources': [
+      'platform_window.h',
+      'platform_window_delegate.h',
+      'platform_window_export.h',
+    ],
+  }],
+}