DevTools: Add a shortcut for switching between files with the same name and different extensions.

LayoutTests/inspector/sources/debugger/switch-file-expected.txt

Index: LayoutTests/inspector/sources/debugger/switch-file-expected.txt
diff --git a/LayoutTests/inspector/sources/debugger/switch-file-expected.txt b/LayoutTests/inspector/sources/debugger/switch-file-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a8d6c1c538eb36a935e1a3749dd4a1635b453582
--- /dev/null
+++ b/LayoutTests/inspector/sources/debugger/switch-file-expected.txt
@@ -0,0 +1,24 @@
+Tests how switch to next file with the same name and different extension feature works.
+
+Dumping next file for each file:
+Next file for http://example.com/foo.css is http://example.com/foo.js.
+Next file for http://example.com/foo.js is http://example.com/foo.ts.
+Next file for http://example.com/foo.js.map is <none>.
+Next file for http://example.com/foo.ts is http://example.com/foo.css.
+Next file for http://example.com/bar.css is http://example.com/bar.js.
+Next file for http://example.com/bar.js is http://example.com/bar.ts.
+Next file for http://example.com/bar.js.map is <none>.
+Next file for http://example.com/bar.ts is http://example.com/bar.css.
+Next file for http://example.com/baz.css is <none>.
+Next file for http://example.com/baz2 is <none>.
+Next file for http://example.com/foo/foo.css is http://example.com/foo/foo.js.
+Next file for http://example.com/foo/foo.js is http://example.com/foo/foo.ts.
+Next file for http://example.com/foo/foo.js.map is <none>.
+Next file for http://example.com/foo/foo.ts is http://example.com/foo/foo.
+Next file for http://example.com/foo/foo is http://example.com/foo/foo.css.
+Next file for http://example.com/bar/foo.css is http://example.com/bar/foo.js.
+Next file for http://example.com/bar/foo.js is http://example.com/bar/foo.ts.
+Next file for http://example.com/bar/foo.js.map is <none>.
+Next file for http://example.com/bar/foo.ts is http://example.com/bar/foo.
+Next file for http://example.com/bar/foo is http://example.com/bar/foo.css.
+