Add WebGPU Backend w/ Dawn Support (#3838)

src/mbgl/webgpu/vertex_buffer_resource.cpp

@@ -0,0 +1,25 @@
+#include <mbgl/webgpu/vertex_buffer_resource.hpp>
+#include <mbgl/webgpu/context.hpp>
+
+namespace mbgl {
+namespace webgpu {
+
+VertexBufferResource::VertexBufferResource(BufferResource&& buffer_) noexcept
+    : buffer(std::move(buffer_)) {
+    if (buffer.getBuffer()) {
+        auto& stats = buffer.getContext().renderingStats();
+        stats.numVertexBuffers++;
+        stats.memVertexBuffers += buffer.getSizeInBytes();
+    }
+}
+
+VertexBufferResource::~VertexBufferResource() noexcept {
+    if (buffer.getBuffer()) {
+        auto& stats = buffer.getContext().renderingStats();
+        stats.numVertexBuffers--;
+        stats.memVertexBuffers -= buffer.getSizeInBytes();
+    }
+}
+
+} // namespace webgpu
+} // namespace mbgl