Add getStateSummary method for diagnostics

Summary:
Adds a more structured representation of state updates than a multiline string.
Also changes the string form to omit [started] records.

Reviewed By: danielbuechele

Differential Revision: D9315503

fbshipit-source-id: 55b8f9572091fd42fe852c8d26a8f2a53f76c82a

xplat/Sonar/SonarClient.cpp

@@ -12,6 +12,7 @@
 #include "SonarState.h"
 #include "SonarStep.h"
 #include "SonarWebSocketImpl.h"
+#include <vector>
 
 #ifdef __ANDROID__
 #include <android/log.h>
@@ -110,10 +111,8 @@ void SonarClient::refreshPlugins() {
 void SonarClient::onConnected() {
   SONAR_LOG("SonarClient::onConnected");
 
-  auto step = sonarState_->start("Connect");
   std::lock_guard<std::mutex> lock(mutex_);
   connected_ = true;
-  step->complete();
 }
 
 void SonarClient::onDisconnected() {
@@ -216,6 +215,10 @@ std::string SonarClient::getState() {
   return sonarState_->getState();
 }
 
+std::vector<StateElement> SonarClient::getStateElements() {
+  return sonarState_->getStateElements();
+}
+
 } // namespace sonar
 } // namespace facebook