scheduler: Add support for tracing scheduler state

content/renderer/scheduler/task_queue_manager.h

Index: content/renderer/scheduler/task_queue_manager.h
diff --git a/content/renderer/scheduler/task_queue_manager.h b/content/renderer/scheduler/task_queue_manager.h
index b1b79357ad3df52d49f85e52d72cb2874dc29e98..888ebfc19613f79d1376be429eac5a1601356e42 100644
--- a/content/renderer/scheduler/task_queue_manager.h
+++ b/content/renderer/scheduler/task_queue_manager.h
@@ -15,6 +15,12 @@
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
 
+namespace base {
+namespace debug {
+class TracedValue;
+}
+}
+
 namespace content {
 namespace internal {
 class TaskQueue;
@@ -69,6 +75,14 @@ class CONTENT_EXPORT TaskQueueManager {
   // lock, so calling it has some overhead.
   bool IsQueueEmpty(size_t queue_index) const;
 
+  // Helpers for serializing the task queue state into state dictionaries for
+  // tracing.
+  void AsValueInto(base::debug::TracedValue* state) const;
+  static void QueueAsValueInto(const base::TaskQueue& queue,
+                               base::debug::TracedValue* state);
+  static void TaskAsValueInto(const base::PendingTask& task,

[rmcilroy, 2014/10/27 17:51:28]

nit - private

[Sami, 2014/10/28 12:57:48]

Done.

+                              base::debug::TracedValue* state);
+
  private:
   friend class internal::TaskQueue;