Adding include guards for print_messages.h

We have had IPC headers where it was up to the user
to carefully only include them once. Jumbo builds where
cc files are compiled together are not that careful so they
need include guards.

This is a followup to equivalent work done in chrome and content.

Bug: 746953
Change-Id: I3dc4067e2c4e23ee41be0def78a34bf4f7cd4b96
Reviewed-on: https://chromium-review.googlesource.com/741597Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#512844}

components/printing/common/print_messages.cc

@@ -7,32 +7,56 @@
 #include "ui/gfx/geometry/size.h"
 
 #define IPC_MESSAGE_IMPL
+#undef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
 #include "components/printing/common/print_messages.h"
+#ifndef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#error "Failed to include header components/printing/common/print_messages.h"
+#endif
 
 // Generate constructors.
 #include "ipc/struct_constructor_macros.h"
+#undef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
 #include "components/printing/common/print_messages.h"
+#ifndef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#error "Failed to include header components/printing/common/print_messages.h"
+#endif
 
 // Generate destructors.
 #include "ipc/struct_destructor_macros.h"
+#undef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
 #include "components/printing/common/print_messages.h"
+#ifndef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#error "Failed to include header components/printing/common/print_messages.h"
+#endif
 
 // Generate param traits write methods.
 #include "ipc/param_traits_write_macros.h"
 namespace IPC {
+#undef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
 #include "components/printing/common/print_messages.h"
+#ifndef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#error "Failed to include header components/printing/common/print_messages.h"
+#endif
 }  // namespace IPC
 
 // Generate param traits read methods.
 #include "ipc/param_traits_read_macros.h"
 namespace IPC {
+#undef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
 #include "components/printing/common/print_messages.h"
+#ifndef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#error "Failed to include header components/printing/common/print_messages.h"
+#endif
 }  // namespace IPC
 
 // Generate param traits log methods.
 #include "ipc/param_traits_log_macros.h"
 namespace IPC {
+#undef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
 #include "components/printing/common/print_messages.h"
+#ifndef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#error "Failed to include header components/printing/common/print_messages.h"
+#endif
 }  // namespace IPC
 
 PrintMsg_Print_Params::PrintMsg_Print_Params()

components/printing/common/print_messages.h

@@ -3,7 +3,8 @@
 // found in the LICENSE file.
 
 // IPC messages for printing.
-// Multiply-included message file, hence no include guard.
+#ifndef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#define COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
 
 #include <stdint.h>
 
@@ -30,8 +31,8 @@
 // Force multiple inclusion of the param traits file to generate all methods.
 #undef COMPONENTS_PRINTING_COMMON_PRINTING_PARAM_TRAITS_MACROS_H_
 
-#ifndef COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
-#define COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#ifndef INTERNAL_COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#define INTERNAL_COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
 
 struct PrintMsg_Print_Params {
   PrintMsg_Print_Params();
@@ -97,7 +98,7 @@ struct PrintHostMsg_SetOptionsFromDocument_Params {
 };
 #endif  // BUILDFLAG(ENABLE_PRINT_PREVIEW)
 
-#endif  // COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
+#endif  // INTERNAL_COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_
 
 #define IPC_MESSAGE_START PrintMsgStart
 
@@ -485,3 +486,5 @@ IPC_MESSAGE_ROUTED1(PrintHostMsg_ShowScriptedPrintPreview,
 IPC_MESSAGE_ROUTED1(PrintHostMsg_SetOptionsFromDocument,
                     PrintHostMsg_SetOptionsFromDocument_Params /* params */)
 #endif  // BUILDFLAG(ENABLE_PRINT_PREVIEW)
+
+#endif  // COMPONENTS_PRINTING_COMMON_PRINT_MESSAGES_H_