tools/gn: rename char_offset to column_number

tools/gn/tokenizer.cc

Index: tools/gn/tokenizer.cc
diff --git a/tools/gn/tokenizer.cc b/tools/gn/tokenizer.cc
index 4dd71d5beaf953e66acaeb19a7d062270f632ee7..0568becbc8dcb51f92808b74c14a83de5cc45f32 100644
--- a/tools/gn/tokenizer.cc
+++ b/tools/gn/tokenizer.cc
@@ -74,7 +74,7 @@ Tokenizer::Tokenizer(const InputFile* input_file, Err* err)
       err_(err),
       cur_(0),
       line_number_(1),
-      char_in_line_(1) {
+      column_number_(1) {
 }
 
 Tokenizer::~Tokenizer() {
@@ -126,7 +126,8 @@ std::vector<Token> Tokenizer::Run() {
           (tokens_.empty() || tokens_.back().type() != Token::SUFFIX_COMMENT ||
            tokens_.back().location().line_number() + 1 !=
                location.line_number() ||
-           tokens_.back().location().char_offset() != location.char_offset())) {
+           tokens_.back().location().column_number() !=
+               location.column_number())) {
         type = Token::LINE_COMMENT;
         if (!at_end())  // Could be EOF.
           Advance();  // The current \n.
@@ -374,16 +375,16 @@ void Tokenizer::Advance() {
   DCHECK(cur_ < input_.size());
   if (IsCurrentNewline()) {
     line_number_++;
-    char_in_line_ = 1;
+    column_number_ = 1;
   } else {
-    char_in_line_++;
+    column_number_++;
   }
   cur_++;
 }
 
 Location Tokenizer::GetCurrentLocation() const {
   return Location(
-      input_file_, line_number_, char_in_line_, static_cast<int>(cur_));
+      input_file_, line_number_, column_number_, static_cast<int>(cur_));
 }
 
 Err Tokenizer::GetErrorForInvalidToken(const Location& location) const {