DevTools: return remote debugging targets sorted by last active time (as it was long ago).

chrome/browser/devtools/device/devtools_device_discovery.cc

Index: chrome/browser/devtools/device/devtools_device_discovery.cc
diff --git a/chrome/browser/devtools/device/devtools_device_discovery.cc b/chrome/browser/devtools/device/devtools_device_discovery.cc
index 432f3dd684e20e4d4fb6d3e1d70d3ef4ac832630..184c5125a8e6ae944ca831088fc5a341cfd1c596 100644
--- a/chrome/browser/devtools/device/devtools_device_discovery.cc
+++ b/chrome/browser/devtools/device/devtools_device_discovery.cc
@@ -138,6 +138,7 @@ class AgentHostDelegate
   bool Activate() override;
   void Reload() override;
   bool Close() override;
+  base::TimeTicks GetLastActivityTime() override;
   void SendMessageToBackend(const std::string& message) override;
 
   void OnSocketOpened() override;
@@ -316,6 +317,10 @@ bool AgentHostDelegate::Close() {
   return true;
 }
 
+base::TimeTicks AgentHostDelegate::GetLastActivityTime() {
+  return base::TimeTicks();
+}
+
 void AgentHostDelegate::SendMessageToBackend(const std::string& message) {
   // We could have detached due to physical connection being closed.
   if (!proxy_)