Send SIGPROF signals on the profiler event processor thread

src/platform-cygwin.cc

Index: src/platform-cygwin.cc
diff --git a/src/platform-cygwin.cc b/src/platform-cygwin.cc
index 8914d636e5c4434dfa78f0f4bf8f758c397d5d50..366765eb42b54dd4c8446dae36ec74307c539a53 100644
--- a/src/platform-cygwin.cc
+++ b/src/platform-cygwin.cc
@@ -776,4 +776,21 @@ void Sampler::Stop() {
 }
 
 
+bool Sampler::CanSampleOnProflerEventsProcessorThread() {
+  return false;
+}
+
+
+void Sampler::DoSample() {
+}
+
+
+void Sampler::StartProfiling() {
+}
+
+
+void Sampler::StopProfiling() {
+}
+
+
 } }  // namespace v8::internal