Test dynamic priorities

base/threading/simple_thread.h

Index: base/threading/simple_thread.h
diff --git a/base/threading/simple_thread.h b/base/threading/simple_thread.h
index 3deeb1018cb573c3f5e48d2b17b7c16a428aa476..e45ba06ce98b2c4e9701347ac8fc7435fada0b81 100644
--- a/base/threading/simple_thread.h
+++ b/base/threading/simple_thread.h
@@ -112,6 +112,9 @@ class BASE_EXPORT SimpleThread : public PlatformThread::Delegate {
   // Overridden from PlatformThread::Delegate:
   void ThreadMain() override;
 
+  bool SetThreadPriority(ThreadPriority priority);
+  ThreadPriority GetThreadPriority() { return priority_; }
+
  private:
   const std::string name_prefix_;
   std::string name_;
@@ -120,6 +123,36 @@ class BASE_EXPORT SimpleThread : public PlatformThread::Delegate {
   WaitableEvent event_;          // Signaled if Start() was ever called.
   PlatformThreadId tid_;         // The backing thread's id.
   bool joined_;                  // True if Join has been called.
+  ThreadPriority priority_;
+};
+
+class BASE_EXPORT TestSimpleThread : public SimpleThread {
+ public:
+  struct BASE_EXPORT PrioritySet {
+    explicit PrioritySet(const ThreadPriority d,
+                         const ThreadPriority l,
+                         const ThreadPriority h)
+        : default_prio(d), low_prio(l), high_prio(h) {}
+    const ThreadPriority default_prio;
+    const ThreadPriority low_prio;
+    const ThreadPriority high_prio;
+  };
+
+  TestSimpleThread(const PrioritySet& priorities,
+                   const std::string& name_prefix,
+                   const Options& options);
+  bool Speedup();
+  bool Slowdown();
+  bool Restore();
+  bool IsDynamic() { return dynamic_prio_; }
+  ThreadPriority GetDefaultPriority() { return priorities_.default_prio; }
+  std::string GetPrioritySetForDebugging();
+
+ private:
+  const PrioritySet priorities_;
+  bool dynamic_prio_;
+  bool changed_;
+  std::string priorities_str_;
 };
 
 class BASE_EXPORT DelegateSimpleThread : public SimpleThread {