gl: Add YVU_420 support to GLImageOzoneNativePixmap.

ui/ozone/public/native_pixmap.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 UI_OZONE_PUBLIC_NATIVE_PIXMAP_H_
 #define UI_OZONE_PUBLIC_NATIVE_PIXMAP_H_
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/native_pixmap_handle_ozone.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/overlay_transform.h"
 
 namespace gfx {
 class Rect;
 class RectF;
 }
 
 namespace ui {
 
 // This represents a buffer that can be directly imported via GL for
 // rendering, or exported via dma-buf fds.
 class NativePixmap : public base::RefCountedThreadSafe<NativePixmap> {
  public:
   NativePixmap() {}
 
   virtual void* /* EGLClientBuffer */ GetEGLClientBuffer() const = 0;
   virtual bool AreDmaBufFdsValid() const = 0;
+  virtual size_t GetDmaBufFdNum() const = 0;

[dnicoara, 2016/06/09 01:17:02]

nit: Not sure how others feel, but I was a bit confused at first by the "Num"
suffix. Perhaps use "Count"?

But I don't have a strong opinion on this.

[Daniele Castagna, 2016/06/09 01:27:58]

Count seems better. Done.

   virtual int GetDmaBufFd(size_t plane) const = 0;
   virtual int GetDmaBufPitch(size_t plane) const = 0;
   virtual int GetDmaBufOffset(size_t plane) const = 0;
   virtual gfx::BufferFormat GetBufferFormat() const = 0;
   virtual gfx::Size GetBufferSize() const = 0;
 
   // Sets the overlay plane to switch to at the next page flip.
   // |w| specifies the screen to display this overlay plane on.
   // |plane_z_order| specifies the stacking order of the plane relative to the
   // main framebuffer located at index 0.
@@ skipping 30 matching lines @@
 
  private:
   friend class base::RefCountedThreadSafe<NativePixmap>;
 
   DISALLOW_COPY_AND_ASSIGN(NativePixmap);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_NATIVE_PIXMAP_H_