Optimize for TouchStart responsiveness

components/scheduler/renderer/renderer_scheduler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/scheduler/renderer/renderer_scheduler.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_impl.h"
 #include "components/scheduler/child/scheduler_task_runner_delegate_impl.h"
@@ skipping 16 matching lines @@
   base::trace_event::TraceLog::GetCategoryGroupEnabled(
       TRACE_DISABLED_BY_DEFAULT("worker.scheduler.debug"));
   base::trace_event::TraceLog::GetCategoryGroupEnabled(
       TRACE_DISABLED_BY_DEFAULT("renderer.scheduler.debug"));
 
   base::MessageLoop* message_loop = base::MessageLoop::current();
   return make_scoped_ptr(new RendererSchedulerImpl(
       SchedulerTaskRunnerDelegateImpl::Create(message_loop)));
 }
 
+// static
+const char* RendererScheduler::UseCaseToString(UseCase use_case) {
+  switch (use_case) {
+    case UseCase::NONE:
+      return "none";
+    case UseCase::COMPOSITOR_GESTURE:
+      return "compositor_gesture";
+    case UseCase::MAIN_THREAD_GESTURE:
+      return "main_thread_gesture";
+    case UseCase::TOUCHSTART:
+      return "touchstart";
+    case UseCase::LOADING:
+      return "loading";
+    default:
+      NOTREACHED();
+      return nullptr;
+  }
+}
+
+// static
+const char* RendererScheduler::InputEventStateToString(
+    InputEventState input_event_state) {
+  switch (input_event_state) {
+    case InputEventState::EVENT_CONSUMED_BY_COMPOSITOR:
+      return "event_consumed_by_compositor";
+    case InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD:
+      return "event_forwarded_to_main_thread";
+    default:
+      NOTREACHED();
+      return nullptr;
+  }
+}
+
 }  // namespace scheduler