Increase number of bits for trace buffer chunk index

base/trace_event/trace_event_impl.h

 // Copyright (c) 2012 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 BASE_TRACE_EVENT_TRACE_EVENT_IMPL_H_
 #define BASE_TRACE_EVENT_TRACE_EVENT_IMPL_H_
 
 #include <stack>
 #include <string>
@@ skipping 48 matching lines @@
   virtual ~ConvertableToTraceFormat() {}
 
  private:
   friend class RefCounted<ConvertableToTraceFormat>;
 };
 
 const int kTraceMaxNumArgs = 2;
 
 struct TraceEventHandle {
   uint32 chunk_seq;
-  uint16 chunk_index;
-  uint16 event_index;
+  // These numbers of bits must be kept consistent with
+  // TraceBufferChunk::kMaxTrunkIndex and
+  // TraceBufferChunk::kTraceBufferChunkSize (in trace_buffer.h).
+  unsigned chunk_index : 26;
+  unsigned event_index : 6;
 };
 
 class BASE_EXPORT TraceEvent {
  public:
   union TraceValue {
     bool as_bool;
     unsigned long long as_uint;
     long long as_int;
     double as_double;
     const void* as_pointer;
@@ skipping 88 matching lines @@
   unsigned long long bind_id_;
   unsigned char arg_types_[kTraceMaxNumArgs];
 
   DISALLOW_COPY_AND_ASSIGN(TraceEvent);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_EVENT_IMPL_H_