Resource Management 5: D3D support for resource allocation.

Refactor existing resource allocators by adding a memory type
and memory handle.

BUG=dawn:27, dawn:153

Change-Id: I090b6ab40e7eaa0d7ea5ce1e8b760e961be9b559
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/9420
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>

src/dawn_native/ResourceMemoryAllocation.h

@@ -0,0 +1,60 @@
+// Copyright 2018 The Dawn Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef DAWNNATIVE_RESOURCEMEMORYALLOCATION_H_
+#define DAWNNATIVE_RESOURCEMEMORYALLOCATION_H_
+
+#include <cstdint>
+
+namespace dawn_native {
+
+    class ResourceHeapBase;
+
+    // Allocation method determines how memory was sub-divided.
+    // Used by the device to get the allocator that was responsible for the allocation.
+    enum class AllocationMethod {
+
+        // Memory not sub-divided.
+        kDirect,
+
+        // Memory sub-divided using one or more blocks of various sizes.
+        kSubAllocated,
+
+        // Memory not allocated or freed.
+        kInvalid
+    };
+
+    // Handle into a resource heap pool.
+    class ResourceMemoryAllocation {
+      public:
+        ResourceMemoryAllocation();
+        ResourceMemoryAllocation(uint64_t offset,
+                                 ResourceHeapBase* resourceHeap,
+                                 AllocationMethod method);
+        ~ResourceMemoryAllocation() = default;
+
+        ResourceHeapBase* GetResourceHeap() const;
+        uint64_t GetOffset() const;
+        AllocationMethod GetAllocationMethod() const;
+
+        void Invalidate();
+
+      private:
+        AllocationMethod mMethod;
+        uint64_t mOffset;
+        ResourceHeapBase* mResourceHeap;
+    };
+}  // namespace dawn_native
+
+#endif  // DAWNNATIVE_RESOURCEMEMORYALLOCATION_H_