Add multiline braille support.

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

Index: chrome/browser/extensions/api/braille_display_private/brlapi_connection.cc
diff --git a/chrome/browser/extensions/api/braille_display_private/brlapi_connection.cc b/chrome/browser/extensions/api/braille_display_private/brlapi_connection.cc
index 5739710383dceb519f03c0051fd71f11a875efd0..a4f7ab1318945134843aae3b1c18a3687014d4ad 100644
--- a/chrome/browser/extensions/api/braille_display_private/brlapi_connection.cc
+++ b/chrome/browser/extensions/api/braille_display_private/brlapi_connection.cc
@@ -43,8 +43,8 @@ class BrlapiConnectionImpl : public BrlapiConnection,
   bool Connected() override { return handle_ != nullptr; }
   brlapi_error_t* BrlapiError() override;
   std::string BrlapiStrError() override;
-  bool GetDisplaySize(size_t* size) override;
-  bool WriteDots(const unsigned char* cells) override;
+  bool GetDisplaySize(unsigned int* rows, unsigned int* columns) override;
+  bool WriteDots(const std::vector<unsigned char> cells) override;
   int ReadKey(brlapi_keyCode_t* keyCode) override;
 
   // MessageLoopForIO::Watcher
@@ -101,9 +101,9 @@ BrlapiConnection::ConnectResult BrlapiConnectionImpl::Connect(
     Disconnect();
     return CONNECT_ERROR_RETRY;
   }
+  unsigned int rows, columns;
 
-  size_t size;
-  if (!GetDisplaySize(&size)) {
+  if (!GetDisplaySize(&rows, &columns)) {
     // Error already logged.
     Disconnect();
     return CONNECT_ERROR_RETRY;
@@ -112,7 +112,7 @@ BrlapiConnection::ConnectResult BrlapiConnectionImpl::Connect(
   // A display size of 0 means no display connected.  We can't reliably
   // detect when a display gets connected, so fail and let the caller
   // retry connecting.
-  if (size == 0) {
+  if (rows * columns == 0) {
     VLOG(1) << "No braille display connected";
     Disconnect();
     return CONNECT_ERROR_RETRY;
@@ -162,24 +162,24 @@ std::string BrlapiConnectionImpl::BrlapiStrError() {
   return libbrlapi_loader_->brlapi_strerror(BrlapiError());
 }
 
-bool BrlapiConnectionImpl::GetDisplaySize(size_t* size) {
+bool BrlapiConnectionImpl::GetDisplaySize(unsigned int* columns,
+                                          unsigned int* rows) {
   if (!CheckConnected()) {
     return false;
   }
-  unsigned int columns, rows;
-  if (libbrlapi_loader_->brlapi__getDisplaySize(
-          handle_.get(), &columns, &rows) < 0) {
+  if (libbrlapi_loader_->brlapi__getDisplaySize(handle_.get(), columns, rows) <
+      0) {
     LOG(ERROR) << "Couldn't get braille display size " << BrlapiStrError();
     return false;
   }
-  *size = columns * rows;
   return true;
 }
 
-bool BrlapiConnectionImpl::WriteDots(const unsigned char* cells) {
+bool BrlapiConnectionImpl::WriteDots(const std::vector<unsigned char> cells) {
+  // Cells is a 2D vector, compressed into 1D.
   if (!CheckConnected())
     return false;
-  if (libbrlapi_loader_->brlapi__writeDots(handle_.get(), cells) < 0) {
+  if (libbrlapi_loader_->brlapi__writeDots(handle_.get(), &cells[0]) < 0) {
     VLOG(1) << "Couldn't write to brlapi: " << BrlapiStrError();
     return false;
   }