Revert of Add builders for tracing event's structural arguments

cc/debug/traced_value.cc

Index: cc/debug/traced_value.cc
diff --git a/cc/debug/traced_value.cc b/cc/debug/traced_value.cc
index 5828cb8894e83e7b8b3338469812dd612eee2d18..3b506ae7e370aa8153f4ac566cb7dfd1fd1c9ca9 100644
--- a/cc/debug/traced_value.cc
+++ b/cc/debug/traced_value.cc
@@ -4,34 +4,26 @@
 
 #include "cc/debug/traced_value.h"
 
-#include "base/debug/trace_event_argument.h"
+#include "base/json/json_writer.h"
 #include "base/strings/stringprintf.h"
+#include "base/values.h"
 
 namespace cc {
 
-void TracedValue::AppendIDRef(const void* id, base::debug::TracedValue* state) {
-  state->BeginDictionary();
-  state->SetString("id_ref", base::StringPrintf("%p", id));
-  state->EndDictionary();
+scoped_ptr<base::Value> TracedValue::CreateIDRef(const void* id) {
+  scoped_ptr<base::DictionaryValue> res(new base::DictionaryValue());
+  res->SetString("id_ref", base::StringPrintf("%p", id));
+  return res.PassAs<base::Value>();
 }
 
-void TracedValue::SetIDRef(const void* id,
-                           base::debug::TracedValue* state,
-                           const char* name) {
-  state->BeginDictionary(name);
-  state->SetString("id_ref", base::StringPrintf("%p", id));
-  state->EndDictionary();
-}
-
-void TracedValue::MakeDictIntoImplicitSnapshot(base::debug::TracedValue* dict,
-                                               const char* object_name,
-                                               const void* id) {
+void TracedValue::MakeDictIntoImplicitSnapshot(
+    base::DictionaryValue* dict, const char* object_name, const void* id) {
   dict->SetString("id", base::StringPrintf("%s/%p", object_name, id));
 }
 
 void TracedValue::MakeDictIntoImplicitSnapshotWithCategory(
     const char* category,
-    base::debug::TracedValue* dict,
+    base::DictionaryValue* dict,
     const char* object_name,
     const void* id) {
   dict->SetString("cat", category);
@@ -40,7 +32,7 @@
 
 void TracedValue::MakeDictIntoImplicitSnapshotWithCategory(
     const char* category,
-    base::debug::TracedValue* dict,
+    base::DictionaryValue* dict,
     const char* object_base_type_name,
     const char* object_name,
     const void* id) {
@@ -49,4 +41,23 @@
   MakeDictIntoImplicitSnapshot(dict, object_name, id);
 }
 
+scoped_refptr<base::debug::ConvertableToTraceFormat> TracedValue::FromValue(
+    base::Value* value) {
+  return scoped_refptr<base::debug::ConvertableToTraceFormat>(
+      new TracedValue(value));
+}
+
+TracedValue::TracedValue(base::Value* value)
+  : value_(value) {
+}
+
+TracedValue::~TracedValue() {
+}
+
+void TracedValue::AppendAsTraceFormat(std::string* out) const {
+  std::string tmp;
+  base::JSONWriter::Write(value_.get(), &tmp);
+  *out += tmp;
+}
+
 }  // namespace cc