Vendor dependencies for GCS

vendor/cloud.google.com/go/internal/readme/Makefile

@@ -0,0 +1,48 @@
+# Rebuild the README.md file at repo root by inserting code samples
+# from compilable go files.
+
+SHELL=/bin/bash
+
+GOCLOUD_HOME=$(GOPATH)/src/cloud.google.com/go
+README=$(GOCLOUD_HOME)/README.md
+
+.PHONY: readme test test-good test-bad-go test-bad-md
+
+readme:
+	@tmp=$$(mktemp); \
+	awk -f snipmd.awk snippets.go $(README) > $$tmp; \
+	mv $$tmp $(README)
+
+diff:
+	diff $(README) <(awk -f snipmd.awk snippets.go $(README))
+
+test: test-good test-bad-go test-bad-md
+	@echo PASS
+
+test-good:
+	@echo testdata/good.md
+	@cd testdata >& /dev/null; \
+	diff -u want.md <(awk -f ../snipmd.awk snips.go good.md)
+	@echo "testdata/want.md (round trip)"
+	@cd testdata >& /dev/null; \
+	diff -u want.md <(awk -f ../snipmd.awk snips.go want.md)
+
+test-bad-go:
+	@for f in testdata/bad-*.go; do \
+	    echo $$f; \
+	    if awk -f snipmd.awk $$f >& /dev/null; then \
+		echo "$f succeeded, want failure"; \
+		exit 1; \
+	    fi; \
+	done
+
+test-bad-md:
+	@for f in testdata/bad-*.md; do \
+	    echo $$f; \
+	    if awk -f snipmd.awk testdata/snips.go $$f >& /dev/null; then \
+		echo "$f succeeded, want failure"; \
+		exit 1; \
+	    fi; \
+	done
+
+