Adding Wayland message loop and gyp build deps

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 3cf06064c60fb8a93739115e3f9e879136ac2127..811597def6f44017134436add62d4719c6e5c881 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -40,6 +40,9 @@
 
           # Whether the compositor is enabled on views.
           'views_compositor%': 0,
+
+          # Whether to build for Wayland display server
+          'use_wayland%': 0,
         },
         # Copy conditionally-set variables out one scope.
         'chromeos%': '<(chromeos)',
@@ -47,6 +50,7 @@
         'touchui%': '<(touchui)',
         'webui_certificate_viewer%': '<(webui_certificate_viewer)',
         'views_compositor%': '<(views_compositor)',
+        'use_wayland%': '<(use_wayland)',

[Evan Martin, 2011/07/21 16:44:21]

I believe all of these nested use_foobars are not necessary, and were perhaps
cargo-culted into the current state.  Perhaps try deleting this change, L43-45,
and then just put the default value of 0 down at L97 along with the comment.

If that doesn't work, it wouldn't surprise me (for complicated reasons), but I
think it ought to.

 
         # Compute the architecture that we're building on.
         'conditions': [
@@ -90,6 +94,7 @@
       'toolkit_views%': '<(toolkit_views)',
       'toolkit_uses_pure_views%': '<(toolkit_uses_pure_views)',
       'views_compositor%': '<(views_compositor)',
+      'use_wayland%': '<(use_wayland)',
 
       # We used to provide a variable for changing how libraries were built.
       # This variable remains until we can clean up all the users.
@@ -211,6 +216,9 @@
           'toolkit_uses_gtk%': 0,
           'use_x11%': 0,
         }, {
+          # TODO Wayland build should have these disabled, but currently
+          # GTK and X is too spread and it's hard to completely remove
+          # every dependency.

[Evan Martin, 2011/07/21 16:44:21]

Can you elaborate on this comment?  I don't know what "too spread" means here.

           'toolkit_uses_gtk%': 1,
           'use_x11%': 1,
         }],
@@ -291,6 +299,7 @@
     'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
     'enable_register_protocol_handler%': '<(enable_register_protocol_handler)',
     'enable_smooth_scrolling%': '<(enable_smooth_scrolling)',
+    'use_wayland%': '<(use_wayland)',
 
     # The release channel that this build targets. This is used to restrict
     # channel-specific build options, like which installer packages to create.
@@ -725,6 +734,9 @@
       ['touchui==1', {
         'defines': ['TOUCH_UI=1'],
       }],
+      ['use_wayland==1', {
+        'defines': ['USE_WAYLAND=1', 'WL_EGL_PLATFORM=1'],
+      }],
       ['file_manager_extension==1', {
         'defines': ['FILE_MANAGER_EXTENSION=1'],
       }],