compositor_unittests target is unimplmented on Mac

ui/gfx/gl/gl_context_nsview.h

Index: ui/gfx/gl/gl_context_nsview.h
diff --git a/ui/gfx/gl/gl_context_nsview.h b/ui/gfx/gl/gl_context_nsview.h
new file mode 100644
index 0000000000000000000000000000000000000000..674df63547029cde3e7fdcf1c57430a85c4244b7
--- /dev/null
+++ b/ui/gfx/gl/gl_context_nsview.h
@@ -0,0 +1,48 @@
+// 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_GL_GL_CONTEXT_NSVIEW_H_
+#define UI_GFX_GL_GL_CONTEXT_NSVIEW_H_
+#pragma once
+
+#import <AppKit/NSOpenGL.h>
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_nsobject.h"
+#include "ui/gfx/gl/gl_context.h"
+
+namespace gfx {
+
+class GLSurface;
+
+// GLContextNSView encapsulates an NSView-based GLContext.  This is paired with
+// the GLSurfaceNSView class.
+class GLContextNSView : public GLContext {
+ public:
+  explicit GLContextNSView(GLShareGroup* group);
+  virtual ~GLContextNSView();
+
+  // GLContext:
+  virtual bool Initialize(GLSurface* surface,
+                          GpuPreference gpu_preference) OVERRIDE;
+  virtual void Destroy() OVERRIDE;
+  virtual bool MakeCurrent(GLSurface* surface) OVERRIDE;
+  virtual void ReleaseCurrent(GLSurface* surface) OVERRIDE;
+  virtual bool IsCurrent(GLSurface* surface) OVERRIDE;
+  virtual void* GetHandle() OVERRIDE;
+  virtual void SetSwapInterval(int interval) OVERRIDE;
+
+  // Flush the |context_|.  Swaps buffers.
+  void FlushBuffer();
+
+ private:
+  scoped_nsobject<NSOpenGLContext> context_;
+  GpuPreference gpu_preference_;
+
+  DISALLOW_COPY_AND_ASSIGN(GLContextNSView);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_GL_GL_CONTEXT_NSVIEW_H_