Add GpuMemoryBuffer support for DXGI handles.

ui/gfx/mojo/buffer_types_struct_traits.cc

Index: ui/gfx/mojo/buffer_types_struct_traits.cc
diff --git a/ui/gfx/mojo/buffer_types_struct_traits.cc b/ui/gfx/mojo/buffer_types_struct_traits.cc
index 186e2eb5502b4f7359053243413dca8e9996e5ed..354f8e7e5b0fa602ac3eeb08ca68bf4b05b398f3 100644
--- a/ui/gfx/mojo/buffer_types_struct_traits.cc
+++ b/ui/gfx/mojo/buffer_types_struct_traits.cc
@@ -64,6 +64,30 @@ StructTraits<gfx::mojom::GpuMemoryBufferHandleDataView,
                                       false);
 }
 
+mojo::ScopedHandle StructTraits<gfx::mojom::GpuMemoryBufferHandleDataView,
+                                gfx::GpuMemoryBufferHandle>::
+    win32_handle(const gfx::GpuMemoryBufferHandle& handle) {
+  if (handle.type != gfx::DXGI_HANDLE)
+    return mojo::ScopedHandle();
+
+#if defined(OS_WIN)
+  DCHECK(handle.handle.OwnershipPassesToIPC());
+  MojoPlatformHandle mojo_platform_handle;
+  mojo_platform_handle.struct_size = sizeof(mojo_platform_handle);
+  mojo_platform_handle.type = MOJO_PLATFORM_HANDLE_TYPE_WINDOWS_HANDLE;
+  mojo_platform_handle.value =
+      reinterpret_cast<uint64_t>(handle.handle.GetHandle());
+  mojo::Handle mojo_handle;
+  MojoResult result = MojoWrapPlatformHandle(&mojo_platform_handle,
+                                             mojo_handle.mutable_value());
+  if (result != MOJO_RESULT_OK)
+    return mojo::ScopedHandle();
+  return mojo::MakeScopedHandle(mojo_handle);
+#else
+  return mojo::ScopedHandle();
+#endif
+}
+
 const gfx::NativePixmapHandle&
 StructTraits<gfx::mojom::GpuMemoryBufferHandleDataView,
              gfx::GpuMemoryBufferHandle>::
@@ -122,6 +146,26 @@ bool StructTraits<gfx::mojom::GpuMemoryBufferHandleDataView,
     out->mach_port.reset(mach_port);
   }
 #endif
+#if defined(OS_WIN)
+  if (out->type == gfx::DXGI_HANDLE) {
+    mojo::ScopedHandle handle = data.TakeWin32Handle();
+    if (handle.is_valid()) {
+      MojoPlatformHandle platform_handle;
+      platform_handle.struct_size = sizeof(platform_handle);
+      MojoResult unwrap_result =
+          MojoUnwrapPlatformHandle(handle.release().value(), &platform_handle);
+
+      if (unwrap_result != MOJO_RESULT_OK)
+        return false;
+      DCHECK_EQ(platform_handle.type, MOJO_PLATFORM_HANDLE_TYPE_WINDOWS_HANDLE);
+      out->handle = base::SharedMemoryHandle(
+          reinterpret_cast<HANDLE>(platform_handle.value), 0,
+          base::UnguessableToken::Create());
+    }
+
+    out->array_level = data.array_level();
+  }
+#endif
   return true;
 }