Add multiline braille support.

chrome/browser/extensions/api/braille_display_private/braille_display_private_api.cc

Index: chrome/browser/extensions/api/braille_display_private/braille_display_private_api.cc
diff --git a/chrome/browser/extensions/api/braille_display_private/braille_display_private_api.cc b/chrome/browser/extensions/api/braille_display_private/braille_display_private_api.cc
index 73d1bdbf342f3c0dda2292decc6ccfcd115fa5e5..ea661710de7b349bbc0849ec84f22d622e8067fa 100644
--- a/chrome/browser/extensions/api/braille_display_private/braille_display_private_api.cc
+++ b/chrome/browser/extensions/api/braille_display_private/braille_display_private_api.cc
@@ -173,7 +173,15 @@ bool BrailleDisplayPrivateWriteDotsFunction::Prepare() {
 }
 
 void BrailleDisplayPrivateWriteDotsFunction::Work() {
-  BrailleController::GetInstance()->WriteDots(params_->cells);
+  std::vector<std::vector<char>> input;
+
+  for (int i = 0; i < params_->rows; i++) {
+    input.push_back(std::vector<char>(params_->columns));
+    for (int j = 0; j < params_->columns; j++) {
+      input[i][j] = params_->cells[i * params_->columns + j];
+    }
+  }
+  BrailleController::GetInstance()->WriteDots(input);
 }
 
 bool BrailleDisplayPrivateWriteDotsFunction::Respond() {