Add compile time checks against longs being used in IPC structs on 32 bit Android.

base/trace_event/trace_log.h

 // Copyright 2015 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_LOG_H_
 #define BASE_TRACE_EVENT_TRACE_LOG_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 21 matching lines @@
 
 class TraceBuffer;
 class TraceBufferChunk;
 class TraceEvent;
 class TraceEventMemoryOverhead;
 class TraceSamplingThread;
 
 struct BASE_EXPORT TraceLogStatus {
   TraceLogStatus();
   ~TraceLogStatus();
-  size_t event_capacity;
-  size_t event_count;
+  uint32_t event_capacity;
+  uint32_t event_count;
 };
 
 class BASE_EXPORT TraceLog : public MemoryDumpProvider {
  public:
   enum Mode {
     DISABLED = 0,
     RECORDING_MODE,
     MONITORING_MODE,
   };
 
@@ skipping 440 matching lines @@
   subtle::AtomicWord generation_;
   bool use_worker_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceLog);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_LOG_H_