[tracing] IPC messages and stubs for inter-process memory dumps

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 157 matching lines @@
       pending_trace_log_status_ack_count_(0),
       maximum_trace_buffer_usage_(0),
       approximate_event_count_(0),
     // Tracing may have been enabled by ContentMainRunner if kTraceStartup
     // is specified in command line.
 #if defined(OS_CHROMEOS) || defined(OS_WIN)
       is_system_tracing_(false),
 #endif
       is_recording_(TraceLog::GetInstance()->IsEnabled()),
       is_monitoring_(false) {
+  base::trace_event::MemoryDumpManager::GetInstance()->SetDelegate(this);
 }
 
 TracingControllerImpl::~TracingControllerImpl() {
   // This is a Leaky instance.
   NOTREACHED();
 }
 
 TracingControllerImpl* TracingControllerImpl::GetInstance() {
   return g_controller.Pointer();
 }
@@ skipping 684 matching lines @@
   DCHECK(tracing_uis_.find(tracing_ui) == tracing_uis_.end());
   tracing_uis_.insert(tracing_ui);
 }
 
 void TracingControllerImpl::UnregisterTracingUI(TracingUI* tracing_ui) {
   std::set<TracingUI*>::iterator it = tracing_uis_.find(tracing_ui);
   DCHECK(it != tracing_uis_.end());
   tracing_uis_.erase(it);
 }
 
+void TracingControllerImpl::RequestGlobalMemoryDump(
+    const base::trace_event::MemoryDumpRequestArgs& args,
+    const base::trace_event::MemoryDumpCallback& callback) {
+  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(&TracingControllerImpl::RequestGlobalMemoryDump,
+                   base::Unretained(this), args, callback));
+    return;
+  }
+  // TODO(primiano): send a local dump request to each of the child processes
+  // and do the bookkeping to keep track of the outstanding requests.

[Sami, 2015/03/31 14:54:36]

s/bookkeping/bookkeeping/

[Primiano Tucci (use gerrit), 2015/04/01 11:05:41]

Done.

+  // Also, at this point, this should check for collisions and bail out if a
+  // global dump is requested while another is already in progress.
+  NOTIMPLEMENTED();
+}
+
+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,
+                   success));
+    return;
+  }
+  // TODO(primiano): update the bookkeping structs and, if this was the response

[Sami, 2015/03/31 14:54:36]

s/bookkeping/bookkeeping/

[Primiano Tucci (use gerrit), 2015/04/01 11:05:41]

Done.

+  // from the last pending child, fire the completion callback, which in turn
+  // will cause a GlobalMemoryDumpResponse message to be sent back to the child,
+  // if this global dump was NOT initiated by the browser.
+  NOTIMPLEMENTED();
+}
+
 void TracingControllerImpl::OnMonitoringStateChanged(bool is_monitoring) {
   if (is_monitoring_ == is_monitoring)
     return;
 
   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