Roll forward to cl/338482889

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I9850950db8bd84f0904ea1a413151887f52098cf

cpp/platform/api/cancelable.h

@@ -0,0 +1,21 @@
+#ifndef PLATFORM_API_CANCELABLE_H_
+#define PLATFORM_API_CANCELABLE_H_
+
+namespace location {
+namespace nearby {
+namespace api {
+
+// An interface to provide a cancellation mechanism for objects that represent
+// long-running operations.
+class Cancelable {
+ public:
+  virtual ~Cancelable() = default;
+
+  virtual bool Cancel() = 0;
+};
+
+}  // namespace api
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_API_CANCELABLE_H_