Update BuiltinProvider to use chrome:// URLs.

chrome/browser/autocomplete/builtin_provider.cc

Index: chrome/browser/autocomplete/builtin_provider.cc
diff --git a/chrome/browser/autocomplete/builtin_provider.cc b/chrome/browser/autocomplete/builtin_provider.cc
index 507d9ed775113e31a50a4a7c8ce55050018e04ca..7fb5159d646e5d949afbedd2041ca08c87348e86 100644
--- a/chrome/browser/autocomplete/builtin_provider.cc
+++ b/chrome/browser/autocomplete/builtin_provider.cc
@@ -6,9 +6,35 @@
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
-#include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/browser_about_handler.h"
 #include "chrome/browser/net/url_fixer_upper.h"
+#include "chrome/common/url_constants.h"
+
+namespace {
+
+// This list should be kept in sync with chrome/common/url_constants.h.
+const char* kChromeSettingsSubPages[] = {
+  chrome::kAdvancedOptionsSubPage,
+  chrome::kAutofillSubPage,
+  chrome::kBrowserOptionsSubPage,
+  chrome::kClearBrowserDataSubPage,
+  chrome::kContentSettingsSubPage,
+  chrome::kContentSettingsExceptionsSubPage,
+  chrome::kImportDataSubPage,
+  chrome::kInstantConfirmPage,
+  chrome::kLanguageOptionsSubPage,
+  chrome::kPersonalOptionsSubPage,
+  chrome::kPasswordManagerSubPage,
+  chrome::kSearchEnginesSubPage,
+  chrome::kSyncSetupSubPage,
+#if defined(OS_CHROMEOS)
+  chrome::kAboutOptionsSubPage,
+  chrome::kInternetOptionsSubPage,
+  chrome::kSystemOptionsSubPage,
+#endif
+};
+
+}  // namespace
 
 const int BuiltinProvider::kRelevance = 575;
 
@@ -17,8 +43,12 @@ BuiltinProvider::BuiltinProvider(ACProviderListener* listener,
     : AutocompleteProvider(listener, profile, "Builtin") {
   std::vector<std::string> builtins(ChromePaths());
   for (std::vector<std::string>::iterator i(builtins.begin());
-       i != builtins.end(); ++i)
-    builtins_.push_back(ASCIIToUTF16("about:") + ASCIIToUTF16(*i));
+      i != builtins.end(); ++i)
+    builtins_.push_back(ASCIIToUTF16(*i));
+  string16 settings(ASCIIToUTF16(chrome::kChromeUISettingsHost) +
+                    ASCIIToUTF16("/"));
+  for (size_t i = 0; i < arraysize(kChromeSettingsSubPages); i++)
+    builtins_.push_back(settings + ASCIIToUTF16(kChromeSettingsSubPages[i]));
 }
 
 BuiltinProvider::~BuiltinProvider() {}
@@ -31,24 +61,65 @@ void BuiltinProvider::Start(const AutocompleteInput& input,
       (input.type() == AutocompleteInput::QUERY) ||
       (input.matches_requested() == AutocompleteInput::BEST_MATCH))
     return;
-  for (Builtins::const_iterator i(builtins_.begin());
-       (i != builtins_.end()) && (matches_.size() < kMaxMatches); ++i) {
-    if (StartsWith(*i, input.text(), false)) {
-      AutocompleteMatch match(this, kRelevance, false,
-                              AutocompleteMatch::NAVSUGGEST);
-      match.fill_into_edit = *i;
-      match.destination_url = GURL(*i);
-      match.contents = match.fill_into_edit;
-      match.contents_class.push_back(ACMatchClassification(0,
-          ACMatchClassification::MATCH | ACMatchClassification::URL));
-      if (match.contents.length() > input.text().length()) {
-        match.contents_class.push_back(
-            ACMatchClassification(input.text().length(),
-                                  ACMatchClassification::URL));
+
+  static const string16 kAbout = ASCIIToUTF16(chrome::kAboutScheme) +
+      ASCIIToUTF16(chrome::kStandardSchemeSeparator);
+  static const string16 kChrome = ASCIIToUTF16(chrome::kChromeUIScheme) +
+      ASCIIToUTF16(chrome::kStandardSchemeSeparator);
+
+  static const int kUrl = ACMatchClassification::URL;
+  static const int kMatch = kUrl | ACMatchClassification::MATCH;
+
+  string16 text = input.text();
+  bool starting_chrome = StartsWith(kChrome, text, false);
+  if (starting_chrome || StartsWith(kAbout, text, false)) {
+    ACMatchClassifications styles;
+    // Highlight the input portion matching "chrome://"; or if the user has
+    // input "about:" (with optional slashes), highlight the whole "chrome://".
+    static const size_t kAboutSchemeLength = strlen(chrome::kAboutScheme);
+    bool highlight = starting_chrome || text.length() > kAboutSchemeLength;
+    styles.push_back(ACMatchClassification(0, highlight ? kMatch : kUrl));
+    size_t offset = starting_chrome ? text.length() : kChrome.length();
+    if (highlight)
+      styles.push_back(ACMatchClassification(offset, kUrl));
+    // Include some common builtin chrome URLs as the user types the scheme.
+    AddMatch(ASCIIToUTF16(chrome::kChromeUIChromeURLsURL), styles);
+    AddMatch(ASCIIToUTF16(chrome::kChromeUISettingsURL), styles);
+    AddMatch(ASCIIToUTF16(chrome::kChromeUIVersionURL), styles);
+  } else {
+    // Match input about: or chrome: URL input against builtin chrome URLs.
+    GURL url = URLFixerUpper::FixupURL(UTF16ToUTF8(text), std::string());
+    if (url.SchemeIs(chrome::kChromeUIScheme) && url.has_host()) {
+      // Include the path for sub-pages (e.g. "chrome://settings/browser").
+      string16 host_and_path = UTF8ToUTF16(url.host() + url.path());
+      TrimString(host_and_path, ASCIIToUTF16("/").c_str(), &host_and_path);
+      size_t match_length = kChrome.length() + host_and_path.length();
+      for (Builtins::const_iterator i(builtins_.begin());
+          (i != builtins_.end()) && (matches_.size() < kMaxMatches); ++i) {
+        if (StartsWith(*i, host_and_path, false)) {
+          ACMatchClassifications styles;
+          // Highlight the "chrome://" scheme, even for input "about:foo".
+          styles.push_back(ACMatchClassification(0, kMatch));
+          string16 match_string = kChrome + *i;
+          if (match_string.length() > match_length)
+            styles.push_back(ACMatchClassification(match_length, kUrl));
+          AddMatch(match_string, styles);
+        }
       }
-      matches_.push_back(match);
     }
   }
+
   for (size_t i = 0; i < matches_.size(); ++i)
     matches_[i].relevance = kRelevance + matches_.size() - (i + 1);
 }
+
+void BuiltinProvider::AddMatch(const string16& match_string,
+                               const ACMatchClassifications& styles) {
+  AutocompleteMatch match(this, kRelevance, false,
+                          AutocompleteMatch::NAVSUGGEST);
+  match.fill_into_edit = match_string;
+  match.destination_url = GURL(match_string);
+  match.contents = match_string;
+  match.contents_class = styles;
+  matches_.push_back(match);
+}