Refactor tracing to pass around base::debug::TraceOptions to reduce spaghetti

Previously, the options for tracing were passed around with different ad hoc
systems. Strings in some places, base::debug::TraceOptions enum in others,
and a content::TraceOptions in yet another. There were two separate ad-hoc
string formats. Similar messes were present with category filters: sometimes
we passed strings, sometimes the CategoryFilter.

This patch though enormous looking simply consolidates all this ad-hockery
into base::debug::TraceOptions. It may look like the call sites have gotten
more verbose,
but the end result of this is a consistent understanding of TraceOptions.

There is one exception to this consolidation: devtools has to maintain its own
mapping of string->TraceOptions encoding. This is because DevTools makes
guarantees about backward compatibility: if base changes its mind about the
string form of a TraceOption, devtools needs to keep supporting the old form.

BUG=396081
TBR=cevans@chromium.org

Review URL: https://codereview.chromium.org/425593002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287348 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 4 deletions

diff --git a/components/tracing/child_trace_message_filter.cc b/components/tracing/child_trace_message_filter.cc
index 3df0f70..e3daa1a 100644
--- a/components/tracing/child_trace_message_filter.cc
+++ b/components/tracing/child_trace_message_filter.cc
@@ -50,7 +50,7 @@ ChildTraceMessageFilter::~ChildTraceMessageFilter() {}
 void ChildTraceMessageFilter::OnBeginTracing(
     const std::string& category_filter_str,
     base::TimeTicks browser_time,
-    int options) {
+    const std::string& options) {
 #if defined(__native_client__)
   // NaCl and system times are offset by a bit, so subtract some time from
   // the captured timestamps. The value might be off by a bit due to messaging
@@ -63,7 +63,7 @@ void ChildTraceMessageFilter::OnBeginTracing(
   TraceLog::GetInstance()->SetEnabled(
       base::debug::CategoryFilter(category_filter_str),
       base::debug::TraceLog::RECORDING_MODE,
-      static_cast<base::debug::TraceLog::Options>(options));
+      base::debug::TraceOptions(options));
 }
 
 void ChildTraceMessageFilter::OnEndTracing() {
@@ -80,11 +80,11 @@ void ChildTraceMessageFilter::OnEndTracing() {
 void ChildTraceMessageFilter::OnEnableMonitoring(
     const std::string& category_filter_str,
     base::TimeTicks browser_time,
-    int options) {
+    const std::string& options) {
   TraceLog::GetInstance()->SetEnabled(
       base::debug::CategoryFilter(category_filter_str),
       base::debug::TraceLog::MONITORING_MODE,
-      static_cast<base::debug::TraceLog::Options>(options));
+      base::debug::TraceOptions(options));
 }
 
 void ChildTraceMessageFilter::OnDisableMonitoring() {