compositor_unittests target is unimplmented on Mac

ui/gfx/native_widget_types.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_NATIVE_WIDGET_TYPES_H_
 #define UI_GFX_NATIVE_WIDGET_TYPES_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
@@ skipping 209 matching lines @@
 // window id.
 #if defined(OS_WIN)
   typedef HWND PluginWindowHandle;
   const PluginWindowHandle kNullPluginWindow = NULL;
 #elif defined(USE_WAYLAND)
   typedef struct wl_egl_window* PluginWindowHandle;
   const PluginWindowHandle kNullPluginWindow = NULL;
 #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
   // is no window present, so mirror that behavior here.
   //
   // The GPU plugin is currently an exception to this rule. As of this
   // writing it uses some NPAPI infrastructure, and minimally we need
   // to identify the plugin instance via this window handle. When the
   // GPU plugin becomes a full-on GPU process, this typedef can be
   // returned to a bool. For now we use a type large enough to hold a
   // pointer on 64-bit architectures in case we need this capability.
   typedef uint64 PluginWindowHandle;
   const PluginWindowHandle kNullPluginWindow = 0;
 #endif
 
 // AcceleratedWidget provides a surface to compositors to paint pixels.
 #if defined(OS_WIN)
 typedef HWND AcceleratedWidget;
 const AcceleratedWidget kNullAcceleratedWidget = NULL;
 #elif defined(USE_WAYLAND)
 typedef struct wl_egl_window* AcceleratedWidget;
 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;
 #endif
 
 }  // namespace gfx
 
 #endif  // UI_GFX_NATIVE_WIDGET_TYPES_H_