[tracing] Reland of Throttle rate of heavy dumps and support to request light/heavy dumps

components/tracing/tracing_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.
 
 // Multiply-included message header, no traditional include guard.
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/metrics/histogram.h"
 #include "base/sync_socket.h"
 #include "base/trace_event/memory_dump_request_args.h"
 #include "base/trace_event/trace_event_impl.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_message_utils.h"
 #include "ipc/ipc_platform_file.h"
 
 #define IPC_MESSAGE_START TracingMsgStart
 
 IPC_STRUCT_TRAITS_BEGIN(base::trace_event::TraceLogStatus)
 IPC_STRUCT_TRAITS_MEMBER(event_capacity)
 IPC_STRUCT_TRAITS_MEMBER(event_count)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(base::trace_event::MemoryDumpRequestArgs)
 IPC_STRUCT_TRAITS_MEMBER(dump_guid)
 IPC_STRUCT_TRAITS_MEMBER(dump_type)
+IPC_STRUCT_TRAITS_MEMBER(dump_args)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(base::trace_event::MemoryDumpArgs)
+  IPC_STRUCT_TRAITS_MEMBER(level_of_detail)
+IPC_STRUCT_TRAITS_END()
+
+IPC_ENUM_TRAITS_MAX_VALUE(
+    base::trace_event::MemoryDumpArgs::LevelOfDetail,
+    base::trace_event::MemoryDumpArgs::LevelOfDetail::LAST)
+
 IPC_ENUM_TRAITS_MAX_VALUE(
     base::trace_event::MemoryDumpType,
     static_cast<int>(base::trace_event::MemoryDumpType::LAST))
 
 // Sent to all child processes to enable trace event recording.
 IPC_MESSAGE_CONTROL3(TracingMsg_BeginTracing,
                      std::string /*  trace_config_str */,
                      base::TraceTicks /* browser_time */,
                      uint64 /* Tracing process id (hash of child id) */)
 
@@ skipping 73 matching lines @@
 IPC_MESSAGE_CONTROL1(TracingHostMsg_GlobalMemoryDumpRequest,
                      base::trace_event::MemoryDumpRequestArgs)
 
 // Reply to TracingMsg_ProcessMemoryDumpRequest.
 IPC_MESSAGE_CONTROL2(TracingHostMsg_ProcessMemoryDumpResponse,
                      uint64 /* dump_guid */,
                      bool /* success */)
 
 IPC_MESSAGE_CONTROL1(TracingHostMsg_TriggerBackgroundTrace,
                      std::string /* name */)