Revert of Revert "Revert 237280 "Remove TraceController""

components/tracing/tracing_messages.h

Index: components/tracing/tracing_messages.h
diff --git a/components/tracing/tracing_messages.h b/components/tracing/tracing_messages.h
index 1107baf3051b292bcd182564afe075b52367207b..25b45bde77cb6bc707842c357026da0f221303e0 100644
--- a/components/tracing/tracing_messages.h
+++ b/components/tracing/tracing_messages.h
@@ -30,7 +30,7 @@
                      base::TimeTicks /* browser_time */,
                      int /* base::debug::TraceLog::Options */)
 
-// Sent to all child processes to stop monitoring.
+// Sent to all child processes to stop monitoring..
 IPC_MESSAGE_CONTROL0(TracingMsg_DisableMonitoring)
 
 // Sent to all child processes to capture the current monitorint snapshot.
@@ -47,9 +47,6 @@
 // Sent to all child processes to clear watch event.
 IPC_MESSAGE_CONTROL0(TracingMsg_CancelWatchEvent)
 
-// Sent everytime when a watch event is matched.
-IPC_MESSAGE_CONTROL0(TracingHostMsg_WatchEventMatched);
-
 // Notify the browser that this child process supports tracing.
 IPC_MESSAGE_CONTROL0(TracingHostMsg_ChildSupportsTracing)
 
@@ -59,6 +56,10 @@
 
 // Reply from child processes acking TracingMsg_CaptureMonitoringSnapshot.
 IPC_MESSAGE_CONTROL0(TracingHostMsg_CaptureMonitoringSnapshotAck)
+
+// Sent if the trace buffer becomes full.
+IPC_MESSAGE_CONTROL1(TracingHostMsg_TraceNotification,
+                     int /* base::debug::TraceLog::Notification */)
 
 // Child processes send back trace data in JSON chunks.
 IPC_MESSAGE_CONTROL1(TracingHostMsg_TraceDataCollected,