diff --git third_party/blink/public/platform/platform.h third_party/blink/public/platform/platform.h
index 52829e870d30a..bf87e1750cd3f 100644
--- third_party/blink/public/platform/platform.h
+++ third_party/blink/public/platform/platform.h
@@ -781,6 +781,11 @@ class BLINK_PLATFORM_EXPORT Platform {
   }
 #endif
 
+  // DevTools ------------------------------------------------------------
+
+  virtual void DevToolsAgentAttached() {}
+  virtual void DevToolsAgentDetached() {}
+
  private:
   static void InitializeMainThreadCommon(
       Platform* platform,
diff --git third_party/blink/renderer/core/inspector/devtools_session.cc third_party/blink/renderer/core/inspector/devtools_session.cc
index ae0907dfd95ec..63620f0aadc14 100644
--- third_party/blink/renderer/core/inspector/devtools_session.cc
+++ third_party/blink/renderer/core/inspector/devtools_session.cc
@@ -10,6 +10,7 @@
 
 #include "base/task/sequenced_task_runner.h"
 #include "base/task/single_thread_task_runner.h"
+#include "third_party/blink/public/platform/platform.h"
 #include "third_party/blink/renderer/bindings/core/v8/script_controller.h"
 #include "third_party/blink/renderer/core/frame/local_frame.h"
 #include "third_party/blink/renderer/core/inspector/devtools_agent.h"
@@ -168,6 +169,7 @@ DevToolsSession::DevToolsSession(
     for (wtf_size_t i = 0; i < agents_.size(); i++)
       agents_[i]->Restore();
   }
+  Platform::Current()->DevToolsAgentAttached();
 }
 
 DevToolsSession::~DevToolsSession() {
@@ -213,6 +215,7 @@ void DevToolsSession::Detach() {
   agents_.clear();
   v8_session_.reset();
   agent_->client_->DebuggerTaskFinished();
+  Platform::Current()->DevToolsAgentDetached();
 }
 
 void DevToolsSession::DetachFromV8() {