Introduces chromium_resources.gyp to factor out Chrome resource generation

ui/aura_shell/aura_shell.gyp

Index: ui/aura_shell/aura_shell.gyp
diff --git a/ui/aura_shell/aura_shell.gyp b/ui/aura_shell/aura_shell.gyp
index 743b832ee2b3d9bb333da467f777872c9758f14e..00d082c11a59c22e67387796072ccf01dbc9e2bf 100644
--- a/ui/aura_shell/aura_shell.gyp
+++ b/ui/aura_shell/aura_shell.gyp
@@ -80,6 +80,7 @@
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:test_support_base',
+        '../../chrome/chrome_resources.gyp:packed_resources',
         '../../build/temp_gyp/googleurl.gyp:googleurl',
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
@@ -110,13 +111,6 @@
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources.rc',
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources_standard/ui_resources_standard.rc',
       ],
-      'conditions': [
-        ['OS!="mac"', {
-          'dependencies': [
-            '../../chrome/chrome.gyp:packed_resources',
-           ],
-        }],
-      ],
     },
     {
       'target_name': 'aura_shell_exe',
@@ -124,6 +118,7 @@
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
+        '../../chrome/chrome_resources.gyp:packed_resources',
         '../../skia/skia.gyp:skia',
         '../../third_party/icu/icu.gyp:icui18n',
         '../../third_party/icu/icu.gyp:icuuc',
@@ -154,7 +149,6 @@
       'conditions': [
         ['OS!="mac"', {
           'dependencies': [
-            '../../chrome/chrome.gyp:packed_resources',
            ],
         }],
       ],