compositor_unittests target is unimplmented on Mac

ui/gfx/gl/gl_surface_nsview.mm

Index: ui/gfx/gl/gl_surface_nsview.mm
diff --git a/ui/gfx/gl/gl_surface_nsview.mm b/ui/gfx/gl/gl_surface_nsview.mm
new file mode 100644
index 0000000000000000000000000000000000000000..0c7f3aab5fca5017f45b45187fa859bbd5307bcd
--- /dev/null
+++ b/ui/gfx/gl/gl_surface_nsview.mm
@@ -0,0 +1,46 @@
+// 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.
+
+#include "ui/gfx/gl/gl_surface_nsview.h"
+
+#import <AppKit/NSOpenGL.h>
+#import <AppKit/NSView.h>
+
+#include "ui/gfx/gl/gl_context_nsview.h"
+
+namespace gfx {
+
+GLSurfaceNSView::GLSurfaceNSView(PluginWindowHandle view)
+    : view_(view),
+      context_(NULL) {
+}
+
+GLSurfaceNSView::~GLSurfaceNSView() {
+}
+
+void GLSurfaceNSView::Destroy() {
+}
+
+bool GLSurfaceNSView::IsOffscreen() {
+  return false;
+}
+
+bool GLSurfaceNSView::SwapBuffers() {
+  context_->FlushBuffer();
+  return true;
+}
+
+gfx::Size GLSurfaceNSView::GetSize() {
+  return gfx::Size(NSSizeToCGSize([view_ bounds].size));
+}
+
+void* GLSurfaceNSView::GetHandle() {
+  return view_;
+}
+
+void GLSurfaceNSView::SetGLContext(GLContextNSView* context) {
+  context_ = context;
+}
+
+}  // namespace gfx