Fix mini_installer for Metro resources.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 2b1cd407919edeaef71ef33c25abddd7559b6f49..6683462693474c79925e4b28a3166e6836fdd3ed 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -44,7 +44,8 @@
           # Enable HiDPI support.
           'enable_hidpi%': 0,
 
-          # Enable Metro support.
+          # Enable inclusion (and therefore use) of touch-optimized assets in the build.

[grt (UTC plus 2), 2012/05/02 13:17:38]

nit: 80 columns

+          # TODO(joi): Rename to enable_touch_assets.
           'enable_metro%': 0,
         },
         # Copy conditionally-set variables out one scope.
@@ -95,6 +96,11 @@
           ['OS=="mac"', {
             'enable_hidpi%': 1,
           }],
+
+          # Touch-optimized resources are enabled by default on Windows.
+          ['OS=="win"', {
+            'enable_metro%': 1,

[grt (UTC plus 2), 2012/05/02 13:17:38]

this will cause theme_resources_metro_1x.pak to start appearing in official
builds (starting with canaries) immediately.  is this desired?

+          }],
         ],
       },