Make cross-process CALayers work on Mac

content/common/gpu/image_transport_surface_calayer_mac.h

+// 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.
+
+#ifndef CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_CALAYER_MAC_H_
+#define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_CALAYER_MAC_H_
+
+#include "base/mac/scoped_nsobject.h"
+#include "content/common/gpu/image_transport_surface_fbo_mac.h"
+#include "ui/base/cocoa/remote_layer_api.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/scoped_cgl.h"
+
+@interface ImageTransportLayer : CAOpenGLLayer {
+  base::ScopedTypeRef<CGLContextObj> shareContext_;
+  GLuint texture_;
+  gfx::Size pixelSize_;
+}
+@end
+
+namespace content {
+
+// Allocate CAOpenGLLayer-backed storage for an FBO image transport surface.
+class CALayerStorageProvider
+    : public ImageTransportSurfaceFBO::StorageProvider {
+ public:
+  CALayerStorageProvider();
+  virtual ~CALayerStorageProvider();
+
+  // ImageTransportSurfaceFBO::StorageProvider implementation:
+  virtual gfx::Size GetRoundedSize(gfx::Size size) OVERRIDE;
+  virtual bool AllocateColorBufferStorage(
+      CGLContextObj context, GLuint texture,
+      gfx::Size pixel_size, float scale_factor) OVERRIDE;
+  virtual void FreeColorBufferStorage() OVERRIDE;
+  virtual uint64 GetSurfaceHandle() const OVERRIDE;
+  virtual void WillSwapBuffers() OVERRIDE;
+
+ private:
+  base::scoped_nsobject<CAContext> context_;
+  base::scoped_nsobject<ImageTransportLayer> layer_;
+
+  DISALLOW_COPY_AND_ASSIGN(CALayerStorageProvider);
+};
+
+}  // namespace content
+
+#endif  //  CONTENT_COMMON_GPU_IMAGE_TRANSPORT_CALAYER_MAC_H_