implement SetWatchEvent and WaitForEvent for trace-based-tests

content/common/child_process_messages.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Common IPC messages used for child processes.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
@@ skipping 65 matching lines @@
 IPC_MESSAGE_CONTROL2(ChildProcessMsg_BeginTracing,
                      std::vector<std::string> /* included_categories */,
                      std::vector<std::string> /* excluded_categories */)
 
 // Sent to all child processes to disable trace event recording.
 IPC_MESSAGE_CONTROL0(ChildProcessMsg_EndTracing)
 
 // Sent to all child processes to get trace buffer fullness.
 IPC_MESSAGE_CONTROL0(ChildProcessMsg_GetTraceBufferPercentFull)
 
+// Sent to all child processes to set watch event.
+IPC_MESSAGE_CONTROL2(ChildProcessMsg_SetWatchEvent,
+                     std::string /* category_name */,
+                     std::string /* event_name */)
+
+// Sent to all child processes to clear watch event.
+IPC_MESSAGE_CONTROL0(ChildProcessMsg_CancelWatchEvent)
+
 // Tell the child process to enable or disable the profiler status.
 IPC_MESSAGE_CONTROL1(ChildProcessMsg_SetProfilerStatus,
                      tracked_objects::ThreadData::Status /* profiler status */)
 
 // Send to all the child processes to send back profiler data (ThreadData in
 // tracked_objects).
 IPC_MESSAGE_CONTROL1(ChildProcessMsg_GetChildProfilerData,
                      int /* sequence_number */)
 
 // Send to all the child processes to send back histogram data.
@@ skipping 14 matching lines @@
 IPC_MESSAGE_CONTROL0(ChildProcessHostMsg_ShutdownRequest)
 
 // Notify the browser that this child process supports tracing.
 IPC_MESSAGE_CONTROL0(ChildProcessHostMsg_ChildSupportsTracing)
 
 // Reply from child processes acking ChildProcessMsg_TraceChangeStatus(false).
 IPC_MESSAGE_CONTROL1(ChildProcessHostMsg_EndTracingAck,
                      std::vector<std::string> /* known_categories */)
 
 // Sent if the trace buffer becomes full.
-IPC_MESSAGE_CONTROL0(ChildProcessHostMsg_TraceBufferFull)
+IPC_MESSAGE_CONTROL1(ChildProcessHostMsg_TraceNotification,
+                     int /* base::debug::TraceLog::Notification */)
 
 // Child processes send trace data back in JSON chunks.
 IPC_MESSAGE_CONTROL1(ChildProcessHostMsg_TraceDataCollected,
                      std::string /*json trace data*/)
 
 // Reply to ChildProcessMsg_GetTraceBufferPercentFull.
 IPC_MESSAGE_CONTROL1(ChildProcessHostMsg_TraceBufferPercentFullReply,
                      float /*trace buffer percent full*/)
 
 // Send back profiler data (ThreadData in tracked_objects).
@@ skipping 23 matching lines @@
 // fill in and pass back to the browser.
 IPC_SYNC_MESSAGE_CONTROL1_1(ChildProcessHostMsg_SyncAllocateSharedMemory,
                             uint32 /* buffer size */,
                             base::SharedMemoryHandle)
 
 #if defined(USE_TCMALLOC)
 // Reply to ChildProcessMsg_GetTcmallocStats.
 IPC_MESSAGE_CONTROL1(ChildProcessHostMsg_TcmallocStats,
                      std::string /* output */)
 #endif