cc: Dump scheduler and tile manager state when commit is blocked.

cc/base/completion_event.h

 // Copyright 2011 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.
 
 #ifndef CC_BASE_COMPLETION_EVENT_H_
 #define CC_BASE_COMPLETION_EVENT_H_
 
 #include "base/logging.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 25 matching lines @@
 
   void Wait() {
 #if DCHECK_IS_ON()
     DCHECK(!waited_);
     waited_ = true;
 #endif
     base::ThreadRestrictions::ScopedAllowWait allow_wait;
     event_.Wait();
   }
 
-  void TimedWait(const base::TimeDelta& max_time) {
+  bool TimedWait(const base::TimeDelta& max_time) {
 #if DCHECK_IS_ON()
     DCHECK(!waited_);
     waited_ = true;
 #endif
-    event_.TimedWait(max_time);
+    base::ThreadRestrictions::ScopedAllowWait allow_wait;
+    if (event_.TimedWait(max_time))
+      return true;
+#if DCHECK_IS_ON()
+    waited_ = false;
+#endif
+    return false;
   }
 
   bool IsSignaled() { return event_.IsSignaled(); }
 
   void Signal() {
 #if DCHECK_IS_ON()
     DCHECK(!signaled_);
     signaled_ = true;
 #endif
     event_.Signal();
   }
 
  private:
   base::WaitableEvent event_;
 #if DCHECK_IS_ON()
   // Used to assert that Wait() and Signal() are each called exactly once.
   bool waited_;
   bool signaled_;
 #endif
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_COMPLETION_EVENT_H_