[CUPS] WebUI handler for CUPS printing: Retrieve the printer list from user preference.

url/url_util.cc

Index: url/url_util.cc
diff --git a/url/url_util.cc b/url/url_util.cc
index c1e997992d3569496b96e64014a79e692bc01bcf..1d37daab6b255c34598c9b92aa13be066c941676 100644
--- a/url/url_util.cc
+++ b/url/url_util.cc
@@ -40,12 +40,21 @@ const SchemeWithType kReferrerURLSchemes[kNumReferrerURLSchemes] = {
   {kHttpsScheme, SCHEME_WITH_PORT},
 };
 
+const int kNumPrinterURLSchemes = 4;
+const SchemeWithType kPrinterURLSchemes[kNumPrinterURLSchemes] = {
+    {kPrinterIppScheme, SCHEME_WITH_PORT},
+    {kPrinterIppsScheme, SCHEME_WITH_PORT},
+    {kPrinterLpdScheme, SCHEME_WITH_PORT},
+    {kPrinterSocketScheme, SCHEME_WITH_PORT},
+};
+
 // Lists of the currently installed standard and referrer schemes. These lists
 // are lazily initialized by InitStandardSchemes and InitReferrerSchemes and are
 // leaked on shutdown to prevent any destructors from being called that will
 // slow us down or cause problems.
 std::vector<SchemeWithType>* standard_schemes = nullptr;
 std::vector<SchemeWithType>* referrer_schemes = nullptr;
+std::vector<SchemeWithType>* printer_schemes = nullptr;
 
 // See the LockSchemeRegistries declaration in the header.
 bool scheme_registries_locked = false;
@@ -84,6 +93,12 @@ void InitReferrerSchemes() {
   InitSchemes(&referrer_schemes, kReferrerURLSchemes, kNumReferrerURLSchemes);
 }
 
+// Ensures that the printer_schemes list is initialized, does nothing if it
+// already has values.
+void InitPrinterSchemes() {
+  InitSchemes(&printer_schemes, kPrinterURLSchemes, kNumPrinterURLSchemes);
+}
+
 // Given a string and a range inside the string, compares it to the given
 // lower-case |compare_to| buffer.
 template<typename CHAR>
@@ -125,6 +140,13 @@ bool DoIsStandard(const CHAR* spec, const Component& scheme, SchemeType* type) {
   return DoIsInSchemes(spec, scheme, type, *standard_schemes);
 }
 
+template <typename CHAR>
+bool IsPrinterScheme(const CHAR* spec,
+                     const Component& scheme,
+                     SchemeType* type) {
+  InitPrinterSchemes();
+  return DoIsInSchemes(spec, scheme, type, *printer_schemes);
+}
 
 template<typename CHAR>
 bool DoFindAndCompareScheme(const CHAR* str,
@@ -204,7 +226,8 @@ bool DoCanonicalize(const CHAR* in_spec,
                                         charset_converter, output,
                                         output_parsed);
 
-  } else if (DoIsStandard(spec, scheme, &unused_scheme_type)) {
+  } else if (DoIsStandard(spec, scheme, &unused_scheme_type) ||
+             IsPrinterScheme(spec, scheme, &unused_scheme_type)) {
     // All "normal" URLs.
     ParseStandardURL(spec, spec_len, &parsed_input);
     success = CanonicalizeStandardURL(spec, spec_len, parsed_input,