DevTools: simplify the async instrumentation harness.

third_party/WebKit/Source/core/inspector/InspectorInstrumentation.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorInstrumentation.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorInstrumentation.cpp b/third_party/WebKit/Source/core/inspector/InspectorInstrumentation.cpp
index 015444f4f3a868caf27b3d8a9c7eb2e913fa6488..14a5377fac370ac52719d22e4aeed9fec3203d8a 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorInstrumentation.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorInstrumentation.cpp
@@ -58,6 +58,26 @@ PersistentHeapHashSet<WeakMember<InstrumentingAgents>>& instrumentingAgentsSet()
 }
 
 namespace InspectorInstrumentation {
+
+AsyncTask::AsyncTask(ExecutionContext* context, void* task) : AsyncTask(context, task, true)
+{
+}
+
+AsyncTask::AsyncTask(ExecutionContext* context, void* task, bool enabled)
+    : m_context(context)
+    , m_task(task)
+    , m_enabled(enabled)
+{
+    if (enabled)
+        InspectorInstrumentation::asyncTaskStarted(context, task);
+}
+
+AsyncTask::~AsyncTask()
+{
+    if (m_enabled)
+        InspectorInstrumentation::asyncTaskFinished(m_context, m_task);
+}
+
 int FrontendCounter::s_frontendCounter = 0;
 
 // Keep in sync with kDevToolsRequestInitiator defined in devtools_network_controller.cc