Adding flow traces for blink scheduler events

Source/platform/scheduler/Scheduler.cpp

Index: Source/platform/scheduler/Scheduler.cpp
diff --git a/Source/platform/scheduler/Scheduler.cpp b/Source/platform/scheduler/Scheduler.cpp
index 4a447721f58921b8fe0500568ed583f76288b5c8..b8c7905a4299271500eaec631a8cf01eebc7dd71 100644
--- a/Source/platform/scheduler/Scheduler.cpp
+++ b/Source/platform/scheduler/Scheduler.cpp
@@ -73,8 +73,8 @@ public:
 class Scheduler::MainThreadPendingTaskRunner : public WebThread::Task {
 public:
     MainThreadPendingTaskRunner(
-        const Scheduler::Task& task, const TraceLocation& location)
-        : m_task(task, location)
+        const Scheduler::Task& task, const TraceLocation& location, const char* traceName)
+        : m_task(task, location, traceName)
     {
         ASSERT(Scheduler::shared());
     }
@@ -90,7 +90,7 @@ public:
         m_task.run();
     }
 
-    Scheduler::TracedTask m_task;
+    TracedTask m_task;
 };
 
 Scheduler* Scheduler::s_sharedScheduler = nullptr;
@@ -142,25 +142,28 @@ void Scheduler::scheduleIdleTask(const TraceLocation& location, const IdleTask&
     m_mainThread->postTask(new MainThreadIdleTaskAdapter(idleTask, 0, location));
 }
 
+void Scheduler::postHighPriorityTaskInternal(const TraceLocation& location, const Task& task, const char* traceName)
+{
+    Locker<Mutex> lock(m_pendingTasksMutex);
+
+    m_pendingHighPriorityTasks.append(TracedTask(task, location, traceName));
+    atomicIncrement(&m_highPriorityTaskCount);
+    maybePostMainThreadPendingHighPriorityTaskRunner();
+}
+
 void Scheduler::postTask(const TraceLocation& location, const Task& task)
 {
-    m_mainThread->postTask(new MainThreadPendingTaskRunner(task, location));
+    m_mainThread->postTask(new MainThreadPendingTaskRunner(task, location, "Scheduler::MainThreadTask"));
 }
 
 void Scheduler::postInputTask(const TraceLocation& location, const Task& task)
 {
-    Locker<Mutex> lock(m_pendingTasksMutex);
-    m_pendingHighPriorityTasks.append(TracedTask(task, location));
-    atomicIncrement(&m_highPriorityTaskCount);
-    maybePostMainThreadPendingHighPriorityTaskRunner();
+    postHighPriorityTaskInternal(location, task, "Scheduler::InputTask");
 }
 
 void Scheduler::postCompositorTask(const TraceLocation& location, const Task& task)
 {
-    Locker<Mutex> lock(m_pendingTasksMutex);
-    m_pendingHighPriorityTasks.append(TracedTask(task, location));
-    atomicIncrement(&m_highPriorityTaskCount);
-    maybePostMainThreadPendingHighPriorityTaskRunner();
+    postHighPriorityTaskInternal(location, task, "Scheduler::CompositorTask");
 }
 
 void Scheduler::maybePostMainThreadPendingHighPriorityTaskRunner()
@@ -266,12 +269,4 @@ bool Scheduler::hasPendingHighPriorityWork() const
     return acquireLoad(&m_highPriorityTaskCount) != 0;
 }
 
-void Scheduler::TracedTask::run()
-{
-    TRACE_EVENT2("blink", "TracedTask::run",
-        "src_file", m_location.fileName(),
-        "src_func", m_location.functionName());
-    m_task();
-}
-
 } // namespace blink