compositor_unittests target is unimplmented on Mac

ui/gfx/gl/gl_context_nsview.mm

Index: ui/gfx/gl/gl_context_nsview.mm
diff --git a/ui/gfx/gl/gl_context_nsview.mm b/ui/gfx/gl/gl_context_nsview.mm
new file mode 100644
index 0000000000000000000000000000000000000000..918e07cb1ac36558027a2292c1bb62910306e666
--- /dev/null
+++ b/ui/gfx/gl/gl_context_nsview.mm
@@ -0,0 +1,77 @@
+// 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_context_nsview.h"
+
+#include <vector>
+
+#import <AppKit/NSOpenGL.h>
+
+#include "base/logging.h"
+
+namespace gfx {
+
+GLContextNSView::GLContextNSView(GLShareGroup* group)
+    : GLContext(group) {
+}
+
+GLContextNSView::~GLContextNSView() {
+}
+
+bool GLContextNSView::Initialize(GLSurface* surface,
+                                 GpuPreference gpu_preference) {
+  DCHECK(!context_) << "NSGLContext was previously initialized.";
+  gpu_preference_ = gpu_preference;
+
+  std::vector<NSOpenGLPixelFormatAttribute> attributes;
+  attributes.push_back(NSOpenGLPFAAccelerated);
+  attributes.push_back(NSOpenGLPFADoubleBuffer);
+  attributes.push_back(0);
+
+  scoped_nsobject<NSOpenGLPixelFormat> pixel_format;
+  pixel_format.reset([[NSOpenGLPixelFormat alloc]
+                         initWithAttributes:&attributes.front()]);
+  if (!pixel_format) {
+    LOG(ERROR) << "NSOpenGLPixelFormat initWithAttributes failed.";
+    return false;
+  }
+
+  context_.reset([[NSOpenGLContext alloc] initWithFormat:pixel_format
+                                            shareContext:nil]);
+  if (!context_) {
+    LOG(ERROR) << "NSOpenGLContext initWithFormat failed";
+    return false;
+  }
+
+  return true;
+}
+
+void GLContextNSView::Destroy() {
+  context_.reset(nil);
+}
+
+bool GLContextNSView::MakeCurrent(GLSurface* surface) {
+  [context_ makeCurrentContext];
+  return true;
+}
+
+void GLContextNSView::ReleaseCurrent(GLSurface* surface) {
+  [NSOpenGLContext clearCurrentContext];
+}
+
+bool GLContextNSView::IsCurrent(GLSurface* surface) {
+  return context_ == [NSOpenGLContext currentContext];
+}
+
+void* GLContextNSView::GetHandle() {
+  return context_;
+}
+
+void GLContextNSView::SetSwapInterval(int interval) {
+  DCHECK(interval == 0 || interval == 1);
+  GLint swap = interval;
+  [context_ setValues:&swap forParameter:NSOpenGLCPSwapInterval];
+}
+
+}  // namespace gfx