Graphite: Add stubs for Gpu and Caps

Bug: skia:12466
Change-Id: I1267d3a387e74dc510ee4d00925049a4e7ac9edd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/452557
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>

experimental/graphite/src/Caps.cpp

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "experimental/graphite/src/Caps.h"
+
+namespace skgpu {
+
+Caps::Caps() {
+}
+
+} // namespace skgpu

experimental/graphite/src/Caps.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef skgpu_Caps_DEFINED
+#define skgpu_Caps_DEFINED
+
+#include "include/core/SkRefCnt.h"
+
+namespace skgpu {
+
+class Caps : public SkRefCnt {
+public:
+    ~Caps() override {}
+
+protected:
+    Caps();
+
+private:
+};
+
+} // namespace skgpu
+
+#endif // skgpu_Caps_DEFINED

experimental/graphite/src/Gpu.cpp

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "experimental/graphite/src/Gpu.h"
+
+#include "experimental/graphite/src/Caps.h"
+
+namespace skgpu {
+
+Gpu::Gpu() {
+}
+
+Gpu::~Gpu() {
+}
+
+} // namespace skgpu

experimental/graphite/src/Gpu.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef skgpu_Gpu_DEFINED
+#define skgpu_Gpu_DEFINED
+
+#include "include/core/SkRefCnt.h"
+
+namespace skgpu {
+
+class Caps;
+
+class Gpu : public SkRefCnt {
+public:
+    ~Gpu() override;
+
+    /**
+     * Gets the capabilities of the draw target.
+     */
+    const Caps* caps() const { return fCaps.get(); }
+    sk_sp<const Caps> refCaps() const { return fCaps; }
+
+protected:
+    Gpu();
+
+private:
+    sk_sp<const Caps> fCaps;
+};
+
+} // namespace skgpu
+
+#endif // skgpu_Gpu_DEFINED

gn/graphite.gni

@@ -13,10 +13,14 @@ skia_graphite_sources = [
   "$_include/Context.h",
   "$_include/SkStuff.h",
   "$_src/BoundsManager.h",
+  "$_src/Caps.cpp",
+  "$_src/Caps.h",
   "$_src/Context.cpp",
   "$_src/Device.cpp",
   "$_src/Device.h",
   "$_src/DrawCommandList.h",
+  "$_src/Gpu.cpp",
+  "$_src/Gpu.h",
   "$_src/Image_Graphite.cpp",
   "$_src/Image_Graphite.h",
   "$_src/SDCTask.cpp",