Refactor trace_event_impl's SetEnabled to use TraceOptions. Propagate this through the whole stack.

content/browser/tracing/trace_message_filter.h

Index: content/browser/tracing/trace_message_filter.h
diff --git a/content/browser/tracing/trace_message_filter.h b/content/browser/tracing/trace_message_filter.h
index 4233fe04480117f81c1f320de365f33d5408b450..8e1398970c09e25e9dd934a681c4e4fc2490d6f0 100644
--- a/content/browser/tracing/trace_message_filter.h
+++ b/content/browser/tracing/trace_message_filter.h
@@ -24,11 +24,11 @@ class TraceMessageFilter : public BrowserMessageFilter {
   virtual void OnChannelClosing() OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
-  void SendBeginTracing(const std::string& category_filter_str,
-                        base::debug::TraceLog::Options options);
+  void SendBeginTracing(const base::debug::CategoryFilter& category_filter_str,

[dsinclair, 2014/07/30 14:25:26]

Let's leave this as strings for now and do a followup CL that converts to
CategoryFilter. Seems separate from the current CL.

+                        const base::debug::TraceOptions& options);
   void SendEndTracing();
-  void SendEnableMonitoring(const std::string& category_filter_str,
-                            base::debug::TraceLog::Options options);
+  void SendEnableMonitoring(const base::debug::CategoryFilter& category_filter,
+                            const base::debug::TraceOptions& options);
   void SendDisableMonitoring();
   void SendCaptureMonitoringSnapshot();
   void SendGetTraceBufferPercentFull();