[Startup Tracing] Add --trace-config-file flag

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
diff --git a/content/browser/gpu/gpu_process_host.cc b/content/browser/gpu/gpu_process_host.cc
index 4c05b639b8b5c5a74bae5101693fec87cfd1c121..30446d2a85cd1ff0c070744619ecc7cf7e3455a9 100644
--- a/content/browser/gpu/gpu_process_host.cc
+++ b/content/browser/gpu/gpu_process_host.cc
@@ -113,6 +113,7 @@ static const char* const kSwitchNames[] = {
   switches::kNoSandbox,
   switches::kProfilerTiming,
   switches::kTestGLLib,
+  switches::kTraceConfigFile,

[no sievers, 2015/08/24 22:50:16]

You are passing this to all child processes, but where do you actually pass the
config to the tracing controller in that process?

[Zhen Wang, 2015/08/25 17:38:14]

When TraceConfigFile is initialized in the child process, it will also read the
specified config file from the file system and create the configuration based on
that.

   switches::kTraceStartup,
   switches::kTraceToConsole,
   switches::kV,