Limit InterProcessTimeTicksConverter to platforms that require it

content/common/inter_process_time_ticks_converter.h

 // Copyright (c) 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 CONTENT_COMMON_INTER_PROCESS_TIME_TICKS_CONVERTER_H_
 #define CONTENT_COMMON_INTER_PROCESS_TIME_TICKS_CONVERTER_H_
 
 #include <stdint.h>
 
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class LocalTimeDelta;
 class LocalTimeTicks;
 class RemoteTimeDelta;
 class RemoteTimeTicks;
 
-// On Windows, TimeTicks are not consistent between processes. Often, the values
-// on one process have a static offset relative to another. Occasionally, these
+// On Windows, TimeTicks are not always consistent between processes as
+// indicated by |TimeTicks::IsConsistentAcrossProcesses()|. Often, the values on
+// one process have a static offset relative to another. Occasionally, these
 // offsets shift while running.
 //
 // To combat this, any TimeTicks values sent from the remote process to the
 // local process must be tweaked in order to appear monotonic.
 //
 // In order to properly tweak ticks, we need 4 reference points:
 //
 // - |local_lower_bound|:  A known point, recorded on the local process, that
 //                         occurs before any remote values that will be
 //                         converted.
@@ skipping 118 matching lines @@
   friend class InterProcessTimeTicksConverter;
 
   RemoteTimeTicks(int64_t value) : value_(value) {}
 
   int64_t value_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_INTER_PROCESS_TIME_TICKS_CONVERTER_H_