[tracing] IPC messages and stubs for inter-process memory dumps

components/tracing/child_trace_message_filter.h

Index: components/tracing/child_trace_message_filter.h
diff --git a/components/tracing/child_trace_message_filter.h b/components/tracing/child_trace_message_filter.h
index 75ab067c745308f57c15778f86ea3c206625d2b7..d3d934097ccfb2f4e21071527b8aa8a1892ce89f 100644
--- a/components/tracing/child_trace_message_filter.h
+++ b/components/tracing/child_trace_message_filter.h
@@ -7,6 +7,7 @@
 
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
+#include "base/trace_event/memory_dump_request_args.h"
 #include "ipc/message_filter.h"
 
 namespace base {
@@ -25,6 +26,10 @@ class ChildTraceMessageFilter : public IPC::MessageFilter {
   void OnFilterRemoved() override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
+  void SendGlobalMemoryDumpRequest(
+      const base::trace_event::MemoryDumpRequestArgs& args,
+      const base::trace_event::MemoryDumpCallback& callback);
+
  protected:
   ~ChildTraceMessageFilter() override;
 
@@ -44,6 +49,9 @@ class ChildTraceMessageFilter : public IPC::MessageFilter {
                        const std::string& event_name);
   void OnCancelWatchEvent();
   void OnWatchEventMatched();
+  void OnProcessMemoryDumpRequest(
+      const base::trace_event::MemoryDumpRequestArgs& args);
+  void OnGlobalMemoryDumpResponse(uint64 dump_guid, bool success);
 
   // Callback from trace subsystem.
   void OnTraceDataCollected(