Allow extension extensions to be case-insensitive.

base/file_path_unittest.cc

Index: base/file_path_unittest.cc
===================================================================
--- base/file_path_unittest.cc	(revision 19502)
+++ base/file_path_unittest.cc	(working copy)
@@ -634,3 +634,34 @@
         ", path: " << path.value() << ", replace: " << cases[i].inputs[1];
   }
 }
+
+TEST_F(FilePathTest, MatchesExtension) {
+  const struct BinaryBooleanTestData cases[] = {
+    { { FPL("foo"),           FPL("") },                    true},
+    { { FPL("foo"),           FPL(".") },                   false},
+    { { FPL("foo."),          FPL("") },                    false},
+    { { FPL("foo."),          FPL(".") },                   true},
+    { { FPL("foo.txt"),       FPL(".dll") },                false},
+    { { FPL("foo.txt"),       FPL(".txt") },                true},
+    { { FPL("foo.txt.dll"),   FPL(".txt") },                false},
+    { { FPL("foo.txt.dll"),   FPL(".dll") },                true},
+#if defined(FILE_PATH_USES_DRIVE_LETTERS)
+    { { FPL("c:/foo.txt.dll"), FPL(".txt") },               false},
+    { { FPL("c:/foo.txt"),    FPL(".txt") },                true},
+#endif  // FILE_PATH_USES_DRIVE_LETTERS
+#if defined(FILE_PATH_USES_WIN_SEPARATORS)
+    { { FPL("c:\\bar\\foo.txt.dll"), FPL(".txt") },         false},
+    { { FPL("c:\\bar\\foo.txt"), FPL(".txt") },             true},
+#endif  // FILE_PATH_USES_DRIVE_LETTERS
+    { { FPL("/bar/foo.txt.dll"), FPL(".txt") },             false},
+    { { FPL("/bar/foo.txt"),  FPL(".txt") },                true},
+  };
+
+  for (size_t i = 0; i < arraysize(cases); ++i) {
+    FilePath path(cases[i].inputs[0]);
+    FilePath::StringType ext(cases[i].inputs[1]);
+
+    EXPECT_EQ(cases[i].expected, path.MatchesExtension(ext)) <<
+        "i: " << i << ", path: " << path.value() << ", ext: " << ext;
+  }
+}