Slow Reports - Add message filter to trigger background traces from child processes.

content/browser/tracing/tracing_controller_impl.cc

 // Copyright (c) 2013 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.
 #include "content/browser/tracing/tracing_controller_impl.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/json/string_escape.h"
 #include "base/macros.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 466 matching lines @@
                                             watch_event_name_);
   }
   if (can_disable_recording()) {
     trace_message_filter->SendBeginTracing(
         TraceLog::GetInstance()->GetCurrentTraceConfig());
   }
   if (can_disable_monitoring()) {
     trace_message_filter->SendEnableMonitoring(
         TraceLog::GetInstance()->GetCurrentTraceConfig());
   }
+  if (!trace_message_filter_added_callback_.is_null())
+    trace_message_filter_added_callback_.Run(trace_message_filter);
 }
 
 void TracingControllerImpl::RemoveTraceMessageFilter(
     TraceMessageFilter* trace_message_filter) {
   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
         base::Bind(&TracingControllerImpl::RemoveTraceMessageFilter,
                    base::Unretained(this),
                    make_scoped_refptr(trace_message_filter)));
     return;
@@ skipping 321 matching lines @@
   pending_memory_dump_filters_ = trace_message_filters_;
 
   for (const scoped_refptr<TraceMessageFilter>& tmf : trace_message_filters_)
     tmf->SendProcessMemoryDumpRequest(args);
 }
 
 bool TracingControllerImpl::IsCoordinatorProcess() const {
   return true;
 }
 
+void TracingControllerImpl::SetTraceMessageFilterAddedCallback(
+    const TraceMessageFilterAddedCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  trace_message_filter_added_callback_ = callback;
+}
+
+void TracingControllerImpl::GetTraceMessageFilters(
+    TraceMessageFilterSet* filters) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  std::copy(trace_message_filters_.begin(), trace_message_filters_.end(),

[dcheng, 2015/07/23 21:11:33]

filters->insert(trace_message_filters_.begin(), trace_message_filters_.end())?

[shatch, 2015/07/23 23:06:52]

Done.

+            std::inserter(*filters, filters->end()));
+}
+
 void TracingControllerImpl::OnProcessMemoryDumpResponse(
     TraceMessageFilter* trace_message_filter,
     uint64 dump_guid,
     bool success) {
   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&TracingControllerImpl::OnProcessMemoryDumpResponse,
                    base::Unretained(this),
                    make_scoped_refptr(trace_message_filter), dump_guid,
@@ skipping 53 matching lines @@
   is_monitoring_ = is_monitoring;
 #if !defined(OS_ANDROID)
   for (std::set<TracingUI*>::iterator it = tracing_uis_.begin();
        it != tracing_uis_.end(); it++) {
     (*it)->OnMonitoringStateChanged(is_monitoring);
   }
 #endif
 }
 
 }  // namespace content