Allow tracing to console everywhere.

content/renderer/render_thread_impl.cc

 // 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.
 
 #include "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
 
 #include "base/allocator/allocator_extension.h"
+#include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/discardable_memory.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/stats_table.h"
 #include "base/path_service.h"
 #include "base/shared_memory.h"
@@ skipping 367 matching lines @@
 #if defined(USE_TCMALLOC) && (defined(OS_LINUX) || defined(OS_ANDROID))
   if (command_line.HasSwitch(switches::kEnableMemoryBenchmarking))
     RegisterExtension(MemoryBenchmarkingExtension::Get());
 #endif  // USE_TCMALLOC
 
   if (command_line.HasSwitch(switches::kEnableSkiaBenchmarking)) {
     LOG(WARNING) << "Enabling unsafe Skia benchmarking extension.";
     RegisterExtension(SkiaBenchmarkingExtension::Get());
   }
 
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kTraceToConsole)) {

[piman, 2013/07/03 17:42:28]

Could we move this to ChildThread, so that it applies to all processes,
including e.g. GPU or Plugin?

[Ian Vollick, 2013/07/03 18:48:03]

That's a great idea. Done.

+    std::string category_string =
+        CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+            switches::kTraceToConsole);
+
+    if (!category_string.size())
+      category_string = "*";
+
+    base::debug::TraceLog::GetInstance()->SetEnabled(
+        base::debug::CategoryFilter(category_string),
+        base::debug::TraceLog::ECHO_TO_CONSOLE);
+  }
+
   context_lost_cb_.reset(new GpuVDAContextLostCallback());
 
   // Note that under Linux, the media library will normally already have
   // been initialized by the Zygote before this instance became a Renderer.
   base::FilePath media_path;
   PathService::Get(DIR_MEDIA_LIBS, &media_path);
   if (!media_path.empty())
     media::InitializeMediaLibrary(media_path);
 
   TRACE_EVENT_END_ETW("RenderThreadImpl::Init", 0, "");
@@ skipping 849 matching lines @@
 
 void RenderThreadImpl::SetFlingCurveParameters(
     const std::vector<float>& new_touchpad,
     const std::vector<float>& new_touchscreen) {
   webkit_platform_support_->SetFlingCurveParameters(new_touchpad,
                                                     new_touchscreen);
 
 }
 
 }  // namespace content