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

ipc/ipc_message_utils.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 IPC_IPC_MESSAGE_UTILS_H_
 #define IPC_IPC_MESSAGE_UTILS_H_
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 174 matching lines @@
                    param_type* r) {
     return iter->ReadInt(reinterpret_cast<int*>(r));
   }
   IPC_EXPORT static void Log(const param_type& p, std::string* l);
 };
 
 template <>
 struct ParamTraits<long> {
   typedef long param_type;
   static void Write(Message* m, const param_type& p) {
-    m->WriteLongUsingDangerousNonPortableLessPersistableForm(p);
+    // To ensure compatibility between 32-bit and 64-bit processes, send as
+    // 64 bit size. We can't check on the writing side if reading may overflow
+    // if sending from 64-bit process and reading from 32-bit process, since we
+    // don't know if this IPC parameter is 64 bit always (i.e. from an int64_t
+    // typedef) or if it's from a size_t.
+    m->WriteLong(p);
   }
   static bool Read(const Message* m,
                    base::PickleIterator* iter,
                    param_type* r) {
     return iter->ReadLong(r);
   }
   IPC_EXPORT static void Log(const param_type& p, std::string* l);
 };
 
 template <>
 struct ParamTraits<unsigned long> {
   typedef unsigned long param_type;
   static void Write(Message* m, const param_type& p) {
-    m->WriteLongUsingDangerousNonPortableLessPersistableForm(p);
+    // See comment in ParamTraits<long>::Write.
+    m->WriteLong(p);
   }
   static bool Read(const Message* m,
                    base::PickleIterator* iter,
                    param_type* r) {
     return iter->ReadLong(reinterpret_cast<long*>(r));
   }
   IPC_EXPORT static void Log(const param_type& p, std::string* l);
 };
 
 template <>
@@ skipping 838 matching lines @@
   template <typename... Ts>
   static void WriteReplyParams(Message* reply, Ts... args) {
     ReplyParam p(args...);
     WriteParam(reply, p);
   }
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_MESSAGE_UTILS_H_