plumbing for skia trace events into Chrome's about://tracing framework

content/renderer/renderer_main.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 "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "base/debug/stack_trace.h"
 #include "base/debug/trace_event.h"
 #include "base/i18n/rtl.h"
@@ skipping 12 matching lines @@
 #include "content/child/child_process.h"
 #include "content/common/content_constants_internal.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/renderer/browser_plugin/browser_plugin_manager_impl.h"
 #include "content/renderer/pepper/pepper_plugin_registry.h"
 #include "content/renderer/render_process_impl.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/renderer_main_platform_delegate.h"
+#include "skia/ext/trace_event.h"
 #include "ui/base/ui_base_switches.h"
 #include "webkit/child/webkit_child_helpers.h"
 
 #if defined(OS_ANDROID)
 #include "base/android/sys_utils.h"
 #include "third_party/skia/include/core/SkGraphics.h"
 #endif  // OS_ANDROID
 
 #if defined(OS_MACOSX)
 #include <Carbon/Carbon.h>
@@ skipping 187 matching lines @@
     }
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
     RenderProcessImpl render_process;
     new RenderThreadImpl();
 #endif
 
     base::HighResolutionTimerManager hi_res_timer_manager;
 
     platform.RunSandboxTests(no_sandbox);
 
+    // Initialize the binding beteween Chrome's tracing events
+    // and Chrome's.  Skia will take ownership of and clean up
+    // the memory allocated here.
+    SkEventTracer::SetInstance(new skia::SkChromiumEventTracer());

[piman, 2014/02/03 22:25:02]

nit: should we do this in the RenderThreadImpl initialization? That'd be more
consistent (and allow it to work in --single-process etc.)

[nduca, 2014/02/04 01:15:19]

yea definitely reder thread impl

[humper, 2014/02/04 19:58:08]

Sure, I'd be happy to move it -- this place was suggested by Nat, but if there's
a better place I'm all for it.

[humper, 2014/02/04 19:58:08]

Done.

+
     startup_timer.Stop();  // End of Startup Time Measurement.
 
     if (run_loop) {
 #if defined(OS_MACOSX)
       if (pool)
         pool->Recycle();
 #endif
       TRACE_EVENT_BEGIN_ETW("RendererMain.START_MSG_LOOP", 0, 0);
       base::MessageLoop::current()->Run();
       TRACE_EVENT_END_ETW("RendererMain.START_MSG_LOOP", 0, 0);
     }
   }
   platform.PlatformUninitialize();
   TRACE_EVENT_END_ETW("RendererMain", 0, "");
   return 0;
 }
 
 }  // namespace content