1 files changed, 27 insertions, 0 deletions
diff --git a/chromium/ui/gl/scoped_cgl.cc b/chromium/ui/gl/scoped_cgl.cc
new file mode 100644
index 00000000000..18eb9808de1
--- /dev/null
+++ b/chromium/ui/gl/scoped_cgl.cc
@@ -0,0 +1,27 @@
+// Copyright 2014 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 "base/logging.h"
+#include "ui/gl/scoped_cgl.h"
+
+namespace gfx {
+
+ScopedCGLSetCurrentContext::ScopedCGLSetCurrentContext(CGLContextObj context) {
+  CGLContextObj previous_context = CGLGetCurrentContext();
+  // It is possible for the previous context to have a zero reference count,
+  // because making a context current does not increment the reference count.
+  // In that case, do not restore the previous context.
+  if (previous_context && CGLGetContextRetainCount(previous_context)) {
+    previous_context_.reset(previous_context, base::scoped_policy::RETAIN);
+  }
+  CGLError error = CGLSetCurrentContext(context);
+  DCHECK_EQ(error, kCGLNoError) << "CGLSetCurrentContext should never fail";
+}
+
+ScopedCGLSetCurrentContext::~ScopedCGLSetCurrentContext() {
+  CGLError error = CGLSetCurrentContext(previous_context_);
+  DCHECK_EQ(error, kCGLNoError) << "CGLSetCurrentContext should never fail";
+}
+
+}  // namespace gfx