Revert of memory-infra: Finish moving to Mojo (2nd attempt)

components/tracing/child/child_trace_message_filter.h

Index: components/tracing/child/child_trace_message_filter.h
diff --git a/components/tracing/child/child_trace_message_filter.h b/components/tracing/child/child_trace_message_filter.h
index 619de78381d91751eacff4561319dbb0496a1be1..287abd3503d2d7f9601b06cff280442bc24fd0fb 100644
--- a/components/tracing/child/child_trace_message_filter.h
+++ b/components/tracing/child/child_trace_message_filter.h
@@ -12,6 +12,7 @@
 #include "base/memory/ref_counted_memory.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
+#include "base/trace_event/memory_dump_request_args.h"
 #include "components/tracing/tracing_export.h"
 #include "ipc/message_filter.h"
 
@@ -31,6 +32,10 @@
   void OnFilterAdded(IPC::Channel* channel) override;
   void OnFilterRemoved() override;
   bool OnMessageReceived(const IPC::Message& message) override;
+
+  void SendGlobalMemoryDumpRequest(
+      const base::trace_event::MemoryDumpRequestArgs& args,
+      const base::trace_event::MemoryDumpCallback& callback);
 
   base::SingleThreadTaskRunner* ipc_task_runner() const {
     return ipc_task_runner_;
@@ -53,6 +58,9 @@
                        const std::string& event_name);
   void OnCancelWatchEvent();
   void OnWatchEventMatched();
+  void OnProcessMemoryDumpRequest(
+      const base::trace_event::MemoryDumpRequestArgs& args);
+  void OnGlobalMemoryDumpResponse(uint64_t dump_guid, bool success);
   void OnSetUMACallback(const std::string& histogram_name,
                         int histogram_lower_value,
                         int histogram_upper_value,
@@ -71,10 +79,19 @@
       const scoped_refptr<base::RefCountedString>& events_str_ptr,
       bool has_more_events);
 
+  void OnProcessMemoryDumpDone(uint64_t dump_guid, bool success);
+
   void SetSenderForTesting(IPC::Sender* sender);
 
   IPC::Sender* sender_;
   base::SingleThreadTaskRunner* ipc_task_runner_;
+
+  // guid of the outstanding request (to the Browser's MemoryDumpManager), if
+  // any. 0 if there is no request pending.
+  uint64_t pending_memory_dump_guid_;
+
+  // callback of the outstanding memory dump request, if any.
+  base::trace_event::MemoryDumpCallback pending_memory_dump_callback_;
 
   base::Time histogram_last_changed_;