Issue-141903: Rename "descheduled" trace event for gpu swap to something understandable

gpu/command_buffer/service/gpu_scheduler.cc

Index: gpu/command_buffer/service/gpu_scheduler.cc
diff --git a/gpu/command_buffer/service/gpu_scheduler.cc b/gpu/command_buffer/service/gpu_scheduler.cc
index ccd84d351d233db9b1cca96bc32e8f61e563180a..c78ae719438511b4801078af55a89d4d2bc66bc1 100644
--- a/gpu/command_buffer/service/gpu_scheduler.cc
+++ b/gpu/command_buffer/service/gpu_scheduler.cc
@@ -129,7 +129,8 @@ void GpuScheduler::SetScheduled(bool scheduled) {
     DCHECK_GE(unscheduled_count_, 0);
 
     if (unscheduled_count_ == 0) {
-      TRACE_EVENT_ASYNC_END1("gpu", "Descheduled", this, "GpuScheduler", this);
+      TRACE_EVENT_ASYNC_END1("gpu", "ProcessingSwap", this,
+                             "GpuScheduler", this);
       // When the scheduler transitions from the unscheduled to the scheduled
       // state, cancel the task that would reschedule it after a timeout.
       reschedule_task_factory_.InvalidateWeakPtrs();
@@ -139,7 +140,7 @@ void GpuScheduler::SetScheduled(bool scheduled) {
     }
   } else {
     if (unscheduled_count_ == 0) {
-      TRACE_EVENT_ASYNC_BEGIN1("gpu", "Descheduled", this,
+      TRACE_EVENT_ASYNC_BEGIN1("gpu", "ProcessingSwap", this,
                                "GpuScheduler", this);
 #if defined(OS_WIN)
       // When the scheduler transitions from scheduled to unscheduled, post a