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

base/debug/trace_event_impl_constants.cc

Index: base/debug/trace_event_impl_constants.cc
diff --git a/base/debug/trace_event_impl_constants.cc b/base/debug/trace_event_impl_constants.cc
index 71e9e08db78ee843c482792d65fbe8c89ed28e64..ad1693e958a8b6a172b0cc46e29c69e663ce0da2 100644
--- a/base/debug/trace_event_impl_constants.cc
+++ b/base/debug/trace_event_impl_constants.cc
@@ -10,5 +10,12 @@ namespace debug {
 // Enable everything but debug and test categories by default.
 const char* CategoryFilter::kDefaultCategoryFilterString = "-*Debug,-*Test";
 
+// Constant used by TraceLog's internal implementation of trace_option.
+const TraceLog::InternalTraceOptions TraceLog::NONE = 0;
+const TraceLog::InternalTraceOptions TraceLog::RECORD_UNTIL_FULL = 1 << 0;
+const TraceLog::InternalTraceOptions TraceLog::RECORD_CONTINUOUSLY = 1 << 1;
+const TraceLog::InternalTraceOptions TraceLog::ENABLE_SAMPLING = 1 << 2;
+const TraceLog::InternalTraceOptions TraceLog::ECHO_TO_CONSOLE = 1 << 3;
+
 }  // namespace debug
 }  // namespace base