First shot at implementing drag&drop for Aura

views/views.gyp

Index: views/views.gyp
diff --git a/views/views.gyp b/views/views.gyp
index fb115d925b837a6e6fe04466681144490e785da8..863ff604647965d52c167e86adef5abd8c3f6032 100644
--- a/views/views.gyp
+++ b/views/views.gyp
@@ -262,6 +262,7 @@
         'drag_controller.h',
         'drag_utils.cc',
         'drag_utils.h',
+        'drag_utils_aura.cc',
         'drag_utils_gtk.cc',
         'drag_utils_linux.cc',
         'drag_utils_win.cc',
@@ -440,6 +441,7 @@
             ['exclude', 'controls/menu/menu_2.*'],
           ],
           'sources!': [
+            'drag_utils_linux.cc',
             'controls/menu/menu_config_linux.cc',
             'controls/menu/menu_item_view_linux.cc',
             'controls/menu/menu_separator_linux.cc',
@@ -469,14 +471,12 @@
             ['OS=="win"', {
               'sources/': [
                 ['include', 'drag_utils_win.cc'],
+                ['exclude', 'drag_utils_aura.cc'],
               ],
             }],
           ],
-        }, { # else: use_aura==1
-          'sources!': [
-            'drag_utils_linux.cc',
-          ]
-        }],
+        },
+        ],
         ['toolkit_uses_gtk == 1', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',