Metro/HiDPI: Move 1x icons into separate pak file

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 659b45d196d5151a9727d4f96fca1d88eeea8281..26590c540a28184a414d3ff1eb6214bf237c9123 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -40,6 +40,9 @@
 
           # Disable viewport meta tag by default.
           'enable_viewport%': 0,
+
+          # Enable HiDPI support.
+          'enable_hidpi%': 0,

[Nico, 2012/04/23 15:51:25]

Do you need to put this in the innermost variables dict? Having it one level
further down saves you one of the "copy variables out one scope" lines and might
be enough.

         },
         # Copy conditionally-set variables out one scope.
         'chromeos%': '<(chromeos)',
@@ -49,6 +52,7 @@
         'use_openssl%': '<(use_openssl)',
         'use_virtual_keyboard%': '<(use_virtual_keyboard)',
         'enable_viewport%': '<(enable_viewport)',
+        'enable_hidpi%': '<(enable_hidpi)',
 
         # Compute the architecture that we're building on.
         'conditions': [
@@ -82,6 +86,11 @@
           }, {
             'toolkit_views%': 0,
           }],
+
+          # Enable HiDPI on Mac OS.
+          ['OS=="mac"', {
+            'enable_hidpi%': 1,
+          }],
         ],
       },
 
@@ -95,6 +104,7 @@
       'use_openssl%': '<(use_openssl)',
       'use_virtual_keyboard%': '<(use_virtual_keyboard)',
       'enable_viewport%': '<(enable_viewport)',
+      'enable_hidpi%': '<(enable_hidpi)',
 
       # We used to provide a variable for changing how libraries were built.
       # This variable remains until we can clean up all the users.
@@ -487,6 +497,7 @@
     'chromeos%': '<(chromeos)',
     'use_virtual_keyboard%': '<(use_virtual_keyboard)',
     'enable_viewport%': '<(enable_viewport)',
+    'enable_hidpi%': '<(enable_hidpi)',
     'use_xi2_mt%':'<(use_xi2_mt)',
     'file_manager_extension%': '<(file_manager_extension)',
     'webui_task_manager%': '<(webui_task_manager)',
@@ -1277,6 +1288,9 @@
       ['notifications==1', {
         'defines': ['ENABLE_NOTIFICATIONS'],
       }],
+      ['enable_hidpi==1', {
+        'defines': ['ENABLE_HIDPI=1'],
+      }],
       ['fastbuild!=0', {
 
         'conditions': [