MacViews: Add native drop shadow to dialogs on OSX < 10.10.

ui/gfx/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 127 matching lines @@
     "mac/io_surface.cc",
     "mac/io_surface.h",
     "mac/nswindow_frame_controls.h",
     "mac/nswindow_frame_controls.mm",
     "mac/scoped_cocoa_disable_screen_updates.h",
     "native_widget_types.h",
     "nine_image_painter.cc",
     "nine_image_painter.h",
     "path.cc",
     "path.h",
+    "path_mac.h",
+    "path_mac.mm",
     "path_win.cc",
     "path_win.h",
     "path_x11.cc",
     "path_x11.h",
     "platform_font.h",
     "platform_font_android.cc",
     "platform_font_ios.h",
     "platform_font_ios.mm",
     "platform_font_linux.cc",
     "platform_font_linux.h",
@@ skipping 527 matching lines @@
       "geometry/rect_unittest.cc",
       "geometry/safe_integer_conversions_unittest.cc",
       "geometry/scroll_offset_unittest.cc",
       "geometry/size_unittest.cc",
       "geometry/vector2d_unittest.cc",
       "geometry/vector3d_unittest.cc",
       "image/image_mac_unittest.mm",
       "image/image_util_unittest.cc",
       "mac/coordinate_conversion_unittest.mm",
       "nine_image_painter_unittest.cc",
+      "path_mac_unittest.mm",
       "platform_font_mac_unittest.mm",
       "range/range_mac_unittest.mm",
       "range/range_unittest.cc",
       "range/range_win_unittest.cc",
       "sequential_id_generator_unittest.cc",
       "shadow_value_unittest.cc",
       "skbitmap_operations_unittest.cc",
       "skrect_conversion_unittest.cc",
       "transform_util_unittest.cc",
       "utf16_indexing_unittest.cc",
@@ skipping 80 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }