compositor_unittests target is unimplmented on Mac

ui/gfx/native_widget_types.h

Index: ui/gfx/native_widget_types.h
diff --git a/ui/gfx/native_widget_types.h b/ui/gfx/native_widget_types.h
index 3c4680de6dcad47a112940d8da80fb48e8180fa9..4f493a0f927960bbe04768e3beb369cd2b29cd1c 100644
--- a/ui/gfx/native_widget_types.h
+++ b/ui/gfx/native_widget_types.h
@@ -227,6 +227,11 @@ static inline NativeView NativeViewFromIdInBrowser(NativeViewId id) {
 #elif defined(USE_X11)
   typedef unsigned long PluginWindowHandle;
   const PluginWindowHandle kNullPluginWindow = 0;
+#elif defined(USE_WEBKIT_COMPOSITOR) && defined(OS_MACOSX)

[Ken Russell (switch to Gerrit), 2011/11/17 00:14:40]

I think that this should be defined as defined(USE_AURA) && defined(OS_MACOSX)
because USE_WEBKIT_COMPOSITOR sounds like it might eventually be supported on
desktop Mac. Looking back at earlier comments, piman had the same feedback. Here
and below.

[dhollowa, 2011/11/17 01:41:51]

Done.  Yes, I'd addressed this in Patch Set 4.  It got missed in PS3.

+  // USE_WEBKIT_COMPOSITOR is defined in service of the USE_AURA port.  These
+  // definitions are currently not in use (or tested) beyond that.
+  typedef NSView* PluginWindowHandle;
+  const PluginWindowHandle kNullPluginWindow = 0;
 #else
   // On OS X we don't have windowed plugins.
   // We use a NULL/0 PluginWindowHandle in shared code to indicate there
@@ -252,6 +257,11 @@ const AcceleratedWidget kNullAcceleratedWidget = NULL;
 #elif defined(USE_X11)
 typedef unsigned long AcceleratedWidget;
 const AcceleratedWidget kNullAcceleratedWidget = 0;
+#elif defined(USE_WEBKIT_COMPOSITOR) && defined(OS_MACOSX)
+// USE_WEBKIT_COMPOSITOR is defined in service of the USE_AURA port.  These
+// definitions are currently not in use (or tested) beyond that.
+typedef NSView* AcceleratedWidget;
+const AcceleratedWidget kNullAcceleratedWidget = 0;
 #else
 typedef void* AcceleratedWidget;
 const AcceleratedWidget kNullAcceleratedWidget = NULL;