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

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index 662b61a63b2e8366d4bc9754324411eabe9f6b48..37eafe961adfb8207564b2e00bdf731a50fe134b 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -54,6 +54,16 @@ struct ParamTraits<ContentSettingsPattern> {
   static void Log(const param_type& p, std::string* l);
 };
 
+// Manual traits since this struct uses size_t and it's in Blink, so avoid
+// changing Blink due to IPC differences.
+template <>
+struct ParamTraits<blink::WebCache::UsageStats> {
+  typedef blink::WebCache::UsageStats param_type;
+  static void Write(Message* m, const param_type& u);
+  static bool Read(const Message* m, base::PickleIterator* iter, param_type* u);
+  static void Log(const param_type& p, std::string* l);
+};
+
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_RENDER_MESSAGES_H_
@@ -160,14 +170,6 @@ IPC_STRUCT_TRAITS_BEGIN(ThemeBackgroundInfo)
   IPC_STRUCT_TRAITS_MEMBER(logo_alternate)
 IPC_STRUCT_TRAITS_END()
 
-IPC_STRUCT_TRAITS_BEGIN(blink::WebCache::UsageStats)
-  IPC_STRUCT_TRAITS_MEMBER(minDeadCapacity)
-  IPC_STRUCT_TRAITS_MEMBER(maxDeadCapacity)
-  IPC_STRUCT_TRAITS_MEMBER(capacity)
-  IPC_STRUCT_TRAITS_MEMBER(liveSize)
-  IPC_STRUCT_TRAITS_MEMBER(deadSize)
-IPC_STRUCT_TRAITS_END()
-
 IPC_ENUM_TRAITS_MAX_VALUE(NTPLoggingEventType,
                           NTP_EVENT_TYPE_LAST)