cros: Use touch theme assets with --touch-optimized-ui

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index c98b4739da57712294ac9b0e2d4817c7b2b8d732..5edb32960ff8914c97fb5d56ee2dc0002fc6229f 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -43,6 +43,9 @@
 
           # Enable HiDPI support.
           'enable_hidpi%': 0,
+          
+          # Enable touch optimized art assets and metrics.
+          'enable_touch_ui%': 0,
 
           # Enable Metro support.
           'enable_metro%': 0,
@@ -56,6 +59,7 @@
         'use_virtual_keyboard%': '<(use_virtual_keyboard)',
         'enable_viewport%': '<(enable_viewport)',
         'enable_hidpi%': '<(enable_hidpi)',
+        'enable_touch_ui%': '<(enable_touch_ui)',
         'enable_metro%': '<(enable_metro)',
 
         # Compute the architecture that we're building on.
@@ -95,6 +99,11 @@
           ['OS=="mac"', {
             'enable_hidpi%': 1,
           }],
+          
+          # Enable touch UI on Metro and Chrome OS.
+          ['enable_metro==1 or chromeos==1', {
+            'enable_touch_ui%': 1,

[sky, 2012/05/02 16:12:21]

Are you sure you want to set this now for chromeos? Should we wait to
automatically set it until 20 branches?

[James Cook, 2012/05/02 16:22:20]

I think it's OK.  It only actually changes the visual appearance if you pass the
flag --touch-optimized-ui to ChromeOS Chrome.  Maybe I should change the name of
the flag to something like 'include_touch_assets'?

+          }],
         ],
       },
 
@@ -109,6 +118,7 @@
       'use_virtual_keyboard%': '<(use_virtual_keyboard)',
       'enable_viewport%': '<(enable_viewport)',
       'enable_hidpi%': '<(enable_hidpi)',
+      'enable_touch_ui%': '<(enable_touch_ui)',
       'enable_metro%': '<(enable_metro)',
 
       # We used to provide a variable for changing how libraries were built.
@@ -511,6 +521,7 @@
     'use_virtual_keyboard%': '<(use_virtual_keyboard)',
     'enable_viewport%': '<(enable_viewport)',
     'enable_hidpi%': '<(enable_hidpi)',
+    'enable_touch_ui%': '<(enable_touch_ui)',
     'enable_metro%': '<(enable_metro)',
     'use_xi2_mt%':'<(use_xi2_mt)',
     'file_manager_extension%': '<(file_manager_extension)',