Simplify document title for Windows printing.

printing/backend/print_backend.cc

Index: printing/backend/print_backend.cc
diff --git a/printing/backend/print_backend.cc b/printing/backend/print_backend.cc
index b993bfc2212a55cedfb31a31443deac1f27c21f8..71f917d44bf394cbce0e30fc5db363f61adcb36b 100644
--- a/printing/backend/print_backend.cc
+++ b/printing/backend/print_backend.cc
@@ -4,6 +4,18 @@
 
 #include "printing/backend/print_backend.h"
 
+#include <algorithm>
+
+#include "third_party/icu/public/common/unicode/uchar.h"
+#include "ui/base/text/text_elider.h"
+
+namespace {
+
+const wchar_t kDefaultDocumentTitle[] = L"Untitled Document";
+const int kMaxDocumentTitleLength = 25;
+
+}  // namespace
+
 namespace printing {
 
 PrinterBasicInfo::PrinterBasicInfo()
@@ -26,4 +38,14 @@ PrinterCapsAndDefaults::~PrinterCapsAndDefaults() {}
 
 PrintBackend::~PrintBackend() {}
 
+string16 PrintBackend::SimplifyDocumentTitle(const string16& title) {
+  string16 no_controls(title);
+  no_controls.erase(
+    std::remove_if(no_controls.begin(), no_controls.end(), &u_iscntrl),
+    no_controls.end());
+  string16 result;
+  ui::ElideString(no_controls, kMaxDocumentTitleLength, &result);
+  return result;
+}
+
 }  // namespace printing