Copy NV12 picture buffers on demand on the main thread.

ui/gl/gl_image_dxgi.h

Index: ui/gl/gl_image_dxgi.h
diff --git a/ui/gl/gl_image_dxgi.h b/ui/gl/gl_image_dxgi.h
index 10d5b2405ff2a4eadaa339543d75f1b18b58ac52..c61946100ee47b893d1061959b7e3275733e3fd3 100644
--- a/ui/gl/gl_image_dxgi.h
+++ b/ui/gl/gl_image_dxgi.h
@@ -5,11 +5,11 @@
 #include <d3d11.h>
 
 #include "base/win/scoped_comptr.h"
-#include "third_party/khronos/EGL/egl.h"
-#include "third_party/khronos/EGL/eglext.h"
 #include "ui/gl/gl_export.h"
 #include "ui/gl/gl_image.h"
 
+typedef void* EGLStreamKHR;
+
 namespace gl {
 
 class GL_EXPORT GLImageDXGI : public GLImage {
@@ -48,7 +48,6 @@ class GL_EXPORT GLImageDXGI : public GLImage {
  protected:
   ~GLImageDXGI() override;
 
- private:
   gfx::Size size_;
 
   EGLStreamKHR stream_;
@@ -56,4 +55,35 @@ class GL_EXPORT GLImageDXGI : public GLImage {
   base::win::ScopedComPtr<ID3D11Texture2D> texture_;
   size_t level_ = 0;
 };
+
+// This copies to a new texture on bind.
+class GL_EXPORT CopyingGLImageDXGI : public GLImageDXGI {
+ public:
+  CopyingGLImageDXGI(const base::win::ScopedComPtr<ID3D11Device>& d3d11_device,
+                     const gfx::Size& size,
+                     EGLStreamKHR stream);
+
+  bool Initialize();
+  bool InitializeVideoProcessor(
+      const base::win::ScopedComPtr<ID3D11VideoProcessor>& video_processor,
+      const base::win::ScopedComPtr<ID3D11VideoProcessorEnumerator>&
+          enumerator);
+  void UnbindFromTexture();
+
+  // GLImage implementation.
+  bool BindTexImage(unsigned target) override;
+
+ private:
+  ~CopyingGLImageDXGI() override;
+
+  bool copied_ = false;
+
+  base::win::ScopedComPtr<ID3D11VideoDevice> video_device_;
+  base::win::ScopedComPtr<ID3D11VideoContext> video_context_;
+  base::win::ScopedComPtr<ID3D11VideoProcessor> d3d11_processor_;
+  base::win::ScopedComPtr<ID3D11VideoProcessorEnumerator> enumerator_;
+  base::win::ScopedComPtr<ID3D11Device> d3d11_device_;
+  base::win::ScopedComPtr<ID3D11Texture2D> decoder_copy_texture_;
+  base::win::ScopedComPtr<ID3D11VideoProcessorOutputView> output_view_;
+};
 }