Snapshot of all changes to get jumbo in blink and content.

components/tracing/common/tracing_messages.h

Index: components/tracing/common/tracing_messages.h
diff --git a/components/tracing/common/tracing_messages.h b/components/tracing/common/tracing_messages.h
index e1d82d6541c3b656b65e1e294e07d06ab40ff099..687262326c6f913247bd6830597666b09e358ef1 100644
--- a/components/tracing/common/tracing_messages.h
+++ b/components/tracing/common/tracing_messages.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef COMPONENTS_TRACING_COMMON_TRACING_MESSAGES_H_
+#define COMPONENTS_TRACING_COMMON_TRACING_MESSAGES_H_
+
 // Multiply-included message header, no traditional include guard.
 
 #include <stdint.h>
@@ -72,3 +75,5 @@ IPC_MESSAGE_CONTROL1(TracingHostMsg_TriggerBackgroundTrace,
                      std::string /* name */)
 
 IPC_MESSAGE_CONTROL0(TracingHostMsg_AbortBackgroundTrace)
+
+#endif  // COMPONENTS_TRACING_COMMON_TRACING_MESSAGES_H_