[DevTools] Rework idle{Started,Finished} instrumentation.

third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp

Index: third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp b/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
index ac2450560028a3b95556d1ae2b6ef655d12b7343..3ac3f85cbeb8b95ead934c5ed3b0f9aded80d39b 100644
--- a/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
+++ b/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
@@ -649,14 +649,14 @@ void WebDevToolsAgentImpl::willProcessTask()
 {
     if (!attached())
         return;
-    InspectorInstrumentation::willProcessTask(m_inspectedFrames->root());
+    ThreadDebugger::idleFinished(V8PerIsolateData::mainThreadIsolate());
 }
 
 void WebDevToolsAgentImpl::didProcessTask()
 {
     if (!attached())
         return;
-    InspectorInstrumentation::didProcessTask(m_inspectedFrames->root());
+    ThreadDebugger::idleStarted(V8PerIsolateData::mainThreadIsolate());
     flushPendingProtocolNotifications();
 }