ozone: Implement support for CreateGpuMemoryBufferFromHandle for OzoneNativePixmap backed GMBs.

ui/ozone/platform/drm/gpu/gbm_buffer.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_PLATFORM_DRM_GPU_GBM_BUFFER_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_GBM_BUFFER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/buffer_types.h"
@@ skipping 23 matching lines @@
             gfx::BufferUsage usage);
   ~GbmBuffer() override;
 
   gfx::BufferUsage usage_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmBuffer);
 };
 
 class GbmPixmap : public NativePixmap {
  public:
-  GbmPixmap(const scoped_refptr<GbmBuffer>& buffer,
-            GbmSurfaceFactory* surface_manager);
-  bool Initialize();
+  explicit GbmPixmap(GbmSurfaceFactory* surface_manager);
+  void Initialize(int dma_buf, int dma_buf_pitch);

[spang, 2015/10/09 17:29:21]

I think we should use ScopedFD instead of int here since ownership is
transferred.

[reveman, 2015/10/09 18:45:32]

Done. I also included the GbmPixmap::dma_buf_ change to ScopedFD as it's awkward
to mix.

+  bool InitializeFromBuffer(const scoped_refptr<GbmBuffer>& buffer);
   void SetScalingCallback(const ScalingCallback& scaling_callback) override;
   scoped_refptr<NativePixmap> GetScaledPixmap(gfx::Size new_size) override;
 
   // NativePixmap:
   void* GetEGLClientBuffer() override;
   int GetDmaBufFd() override;
   int GetDmaBufPitch() override;
   bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                             int plane_z_order,
                             gfx::OverlayTransform plane_transform,
                             const gfx::Rect& display_bounds,
                             const gfx::RectF& crop_rect) override;
   gfx::NativePixmapHandle ExportHandle() override;
 
   scoped_refptr<GbmBuffer> buffer() { return buffer_; }
 
  private:
   ~GbmPixmap() override;
   bool ShouldApplyScaling(const gfx::Rect& display_bounds,
                           const gfx::RectF& crop_rect,
                           gfx::Size* required_size);
 
   scoped_refptr<GbmBuffer> buffer_;
   int dma_buf_ = -1;
+  int dma_buf_pitch_ = -1;
 
   GbmSurfaceFactory* surface_manager_;
 
   ScalingCallback scaling_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmPixmap);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_GBM_BUFFER_H_