Update from https://crrev.com/308996

cc/output/begin_frame_args.h

 // Copyright 2013 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_OUTPUT_BEGIN_FRAME_ARGS_H_
 #define CC_OUTPUT_BEGIN_FRAME_ARGS_H_
 
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
@@ skipping 24 matching lines @@
 #endif
 
 namespace cc {
 
 struct CC_EXPORT BeginFrameArgs {
   enum BeginFrameArgsType {
     INVALID,
     NORMAL,
     SYNCHRONOUS,
     MISSED,
+    // Not a real type, but used by the IPC system. Should always remain the
+    // *last* value in this enum.
+    BEGIN_FRAME_ARGS_TYPE_MAX,
   };
   static const char* TypeToString(BeginFrameArgsType type);
 
   // Creates an invalid set of values.
   BeginFrameArgs();
 
 #ifdef NDEBUG
   typedef const void* CreationLocation;
 #else
   typedef const tracked_objects::Location& CreationLocation;
@@ skipping 36 matching lines @@
  private:
   BeginFrameArgs(base::TimeTicks frame_time,
                  base::TimeTicks deadline,
                  base::TimeDelta interval,
                  BeginFrameArgsType type);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_BEGIN_FRAME_ARGS_H_