Mac h264: Work around CGLContext+VTDecompresionSession deadlock

ui/gl/gl_image_io_surface.h

 // Copyright 2013 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_GL_GL_IMAGE_IO_SURFACE_H_
 #define UI_GL_GL_IMAGE_IO_SURFACE_H_
 
 #include <CoreVideo/CVPixelBuffer.h>
 #include <IOSurface/IOSurface.h>
 #include <stdint.h>
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/generic_shared_memory_id.h"
 #include "ui/gl/gl_image.h"
 
 #if defined(__OBJC__)
 @class CALayer;
 #else
 typedef void* CALayer;
 #endif
@@ skipping 40 matching lines @@
   base::ScopedCFTypeRef<CVPixelBufferRef> cv_pixel_buffer();
 
   static void SetLayerForWidget(gfx::AcceleratedWidget widget, CALayer* layer);
 
   static unsigned GetInternalFormatForTesting(gfx::BufferFormat format);
 
  protected:
   ~GLImageIOSurface() override;
 
  private:
+  class RGBConverter;
+
   const gfx::Size size_;
   const unsigned internalformat_;
   gfx::BufferFormat format_;
   base::ScopedCFTypeRef<IOSurfaceRef> io_surface_;
   base::ScopedCFTypeRef<CVPixelBufferRef> cv_pixel_buffer_;
   gfx::GenericSharedMemoryId io_surface_id_;
   base::ThreadChecker thread_checker_;
 
   // GL state to support 420v IOSurface conversion to RGB.
-  unsigned framebuffer_ = 0;
-  unsigned vertex_shader_ = 0;
-  unsigned fragment_shader_ = 0;
-  unsigned program_ = 0;
-  int size_location_ = -1;
-  unsigned vertex_buffer_ = 0;
-  unsigned yuv_textures_[2] = {};
+  scoped_ptr<RGBConverter> rgb_converter_;
 
   DISALLOW_COPY_AND_ASSIGN(GLImageIOSurface);
 };
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_IMAGE_IO_SURFACE_H_