gpu: Add YCbCr 420v extension.

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 <IOSurface/IOSurface.h>
 
 #include "base/mac/scoped_cftyperef.h"
@@ skipping 46 matching lines @@
   ~GLImageIOSurface() override;
 
  private:
   const gfx::Size size_;
   const unsigned internalformat_;
   gfx::BufferFormat format_;
   base::ScopedCFTypeRef<IOSurfaceRef> io_surface_;
   gfx::GenericSharedMemoryId io_surface_id_;
   base::ThreadChecker thread_checker_;
 
+  // GL state to support 420v IOSurface binding as RGBA.

[reveman, 2015/10/29 22:08:04]

nit: s/binding as RGBA/conversion to RGB/

[Daniele Castagna, 2015/10/30 23:51:57]

Done.

+  unsigned framebuffer_ = 0;
+  unsigned vertex_shader_ = 0;
+  unsigned fragment_shader_ = 0;
+  unsigned program_ = 0;
+  int size_location_ = -1;
+  unsigned vertex_buffer_ = 0;
+  static const char kVertexShader[];
+  static const char kFragmentShader[];

[reveman, 2015/10/29 22:08:03]

does these last two need to be here? anonymous namespace or just constants in
the function where they are used instead?

[Daniele Castagna, 2015/10/30 23:51:57]

No, moved in the anonymous namespace in the .mm file.

+
   DISALLOW_COPY_AND_ASSIGN(GLImageIOSurface);
 };
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_IMAGE_IO_SURFACE_H_