gpu: win: Replace root GLSurface with SharedImage DComp overlay

Implement SkiaOutputDeviceDCompPresenter, which owns a SharedImage for
use as the root surface. This is in contrast with
DirectCompositionSurfaceWin, which is a GLSurface that owns the back
buffer.

The plan is to have both SkiaOutputDeviceDComp implementations
selectable with a feature flag. Then, after experimentation with
DCompPresenter, we will remove the feature flag,
DirectComposition[Child]SurfaceWin (and related types) and merge
SkiaOutputDeviceDCompPresenter with SkiaOutputDeviceDComp.

Removal of DirectComposition[Child]SurfaceWin will allow many
Windows-specific functions on GLSurface be removed (and may help
GLSurface itself be removed).

Bug: 1378741
Change-Id: Ia2215e1289b926a7696c535ec03781c2028da53b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3984093
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Michael Tang <tangm@microsoft.com>
Reviewed-by: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1096558}

components/viz/service/BUILD.gn

@@ -563,9 +563,16 @@ viz_source_set("unit_tests") {
     sources += [
       "display/overlay_dc_unittest.cc",
       "display_embedder/output_device_backing_unittest.cc",
+      "display_embedder/skia_output_device_dcomp_unittest.cc",
       "display_embedder/software_output_device_win_unittest.cc",
     ]
 
+    deps += [
+      "//ui/gl:test_support",
+      "//ui/platform_window",
+      "//ui/platform_window/win",
+    ]
+
     # SkiaOutputDeviceBufferQueue doesn't support Windows.
     sources -=
         [ "display_embedder/skia_output_device_buffer_queue_unittest.cc" ]

components/viz/service/display_embedder/skia_output_device.h

@@ -18,6 +18,7 @@
 #include "components/viz/service/display/output_surface_frame.h"
 #include "components/viz/service/display/overlay_processor_interface.h"
 #include "components/viz/service/display/skia_output_surface.h"
+#include "components/viz/service/viz_service_export.h"
 #include "gpu/command_buffer/common/swap_buffers_complete_params.h"
 #include "third_party/abseil-cpp/absl/types/optional.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
@@ -50,10 +51,10 @@ namespace viz {
 
 class VulkanContextProvider;
 
-class SkiaOutputDevice {
+class VIZ_SERVICE_EXPORT SkiaOutputDevice {
  public:
   // A helper class for defining a BeginPaint() and EndPaint() scope.
-  class ScopedPaint {
+  class VIZ_SERVICE_EXPORT ScopedPaint {
    public:
     ScopedPaint(std::vector<GrBackendSemaphore> end_semaphores,
                 SkiaOutputDevice* device,