tint->dawn: Shuffle source tree in preperation of merging repos

docs/    -> docs/tint/
fuzzers/ -> src/tint/fuzzers/
samples/ -> src/tint/cmd/
src/     -> src/tint/
test/    -> test/tint/

BUG=tint:1418,tint:1433

Change-Id: Id2aa79f989aef3245b80ef4aa37a27ff16cd700b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/80482
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
diff --git a/src/tint/ast/storage_class.cc b/src/tint/ast/storage_class.cc
new file mode 100644
index 0000000..b760647
--- /dev/null
+++ b/src/tint/ast/storage_class.cc
@@ -0,0 +1,51 @@
+// Copyright 2020 The Tint 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.
+
+#include "src/tint/ast/storage_class.h"
+
+namespace tint {
+namespace ast {
+
+const char* ToString(StorageClass sc) {
+  switch (sc) {
+    case StorageClass::kInvalid:
+      return "invalid";
+    case StorageClass::kNone:
+      return "none";
+    case StorageClass::kInput:
+      return "in";
+    case StorageClass::kOutput:
+      return "out";
+    case StorageClass::kUniform:
+      return "uniform";
+    case StorageClass::kWorkgroup:
+      return "workgroup";
+    case StorageClass::kUniformConstant:
+      return "uniform_constant";
+    case StorageClass::kStorage:
+      return "storage";
+    case StorageClass::kPrivate:
+      return "private";
+    case StorageClass::kFunction:
+      return "function";
+  }
+  return "<unknown>";
+}
+std::ostream& operator<<(std::ostream& out, StorageClass sc) {
+  out << ToString(sc);
+  return out;
+}
+
+}  // namespace ast
+}  // namespace tint