Add full support for filesystem URLs.

chrome/common/extensions/extension.cc

Index: chrome/common/extensions/extension.cc
diff --git a/chrome/common/extensions/extension.cc b/chrome/common/extensions/extension.cc
index a6d2159d418855e923f02a14073f254d616bc5ab..a12fce851e33bf3202e7ab6cf3405ea707729420 100644
--- a/chrome/common/extensions/extension.cc
+++ b/chrome/common/extensions/extension.cc
@@ -2295,16 +2295,27 @@ FileBrowserHandler* Extension::LoadFileBrowserHandler(
       return NULL;
     }
     StringToLowerASCII(&filter);
-    URLPattern pattern(URLPattern::SCHEME_FILESYSTEM);
+    if (!StartsWithASCII(filter,
+                         std::string(chrome::kFileSystemScheme) + ':',
+                         true)) {
+      *error = ExtensionErrorUtils::FormatErrorMessageUTF16(
+          errors::kInvalidURLPatternError, filter);
+      return NULL;
+    }
+    // The user inputs filesystem:*; we don't actually implement scheme
+    // wildcards in URLPattern, so transform to what will match correctly.
+    filter.replace(0, 11, "chrome-extension://*/");
+    URLPattern pattern(URLPattern::SCHEME_EXTENSION);
+    pattern.SetMatchNestedURLPath(true);
     if (pattern.Parse(filter) != URLPattern::PARSE_SUCCESS) {
       *error = ExtensionErrorUtils::FormatErrorMessageUTF16(
           errors::kInvalidURLPatternError, filter);
       return NULL;
     }
     std::string path = pattern.path();
-    bool allowed = path == "*" || path == "*.*" ||
-        (path.compare(0, 2, "*.") == 0 &&
-         path.find_first_of('*', 2) == std::string::npos);
+    bool allowed = path == "/*" || path == "/*.*" ||
+        (path.compare(0, 3, "/*.") == 0 &&
+         path.find_first_of('*', 3) == std::string::npos);
     if (!allowed) {
       *error = ExtensionErrorUtils::FormatErrorMessageUTF16(
           errors::kInvalidURLPatternError, filter);