Emit edit tracking information from *all* rewriters.

tools/clang/rewrite_to_chrome_style/EditTracker.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "EditTracker.h"
 
 #include <assert.h>
 #include <stdio.h>
 #include "llvm/Support/Path.h"
 #include "llvm/Support/raw_ostream.h"
 
+namespace {
+
+const char* GetTag(RenameCategory category) {
+  switch (category) {
+    case RenameCategory::kEnumValue:
+      return "enum";
+    case RenameCategory::kField:
+      return "var";
+    case RenameCategory::kFunction:
+      return "func";
+    case RenameCategory::kUnresolved:
+      return "unresolved";
+    case RenameCategory::kVariable:
+      return "var";
+  }
+}
+
+}  // namespace
+
+EditTracker::EditTracker(RenameCategory category) : category_(category) {}
+
 void EditTracker::Add(const clang::SourceManager& source_manager,
                       clang::SourceLocation location,
                       llvm::StringRef original_text,
                       llvm::StringRef new_text) {
   llvm::StringRef filename;
   for (int i = 0; i < 10; i++) {
     filename = source_manager.getFilename(location);
     if (!filename.empty() || !location.isMacroID())
       break;
     // Otherwise, no filename and the SourceLocation is a macro ID. Look one
     // level up the stack...
     location = source_manager.getImmediateMacroCallerLoc(location);
   }
   assert(!filename.empty() && "Can't track edit with no filename!");
   auto result = tracked_edits_.try_emplace(original_text);
   if (result.second) {
     result.first->getValue().new_text = new_text;
   }
   result.first->getValue().filenames.try_emplace(filename);
 }
 
-void EditTracker::SerializeTo(llvm::StringRef tag,
-                              llvm::raw_ostream& output) const {
+void EditTracker::SerializeTo(llvm::raw_ostream& output) const {
+  const char* tag = GetTag(category_);
   for (const auto& edit : tracked_edits_) {
     for (const auto& filename : edit.getValue().filenames) {
       output << filename.getKey() << ":" << tag << ":" << edit.getKey() << ":"
              << edit.getValue().new_text << "\n";
     }
   }
 }