Mention Chromium X-Refs plugin in the sublime text docs

docs/linux_sublime_dev.md

 # Linux Sublime Dev
 
 Sublime Text is a fast, powerful and easily extensible code editor. Check out
 some [visual demos](http://www.sublimetext.com) for a quick demonstration.
 
 You can download and install Sublime Text 3 from the [Sublime Text
 Website](http://www.sublimetext.com/3). Assuming you have access to the right
 repositories, you can also install Sublime via apt-get on Linux. Help and
 general documentation is available in the [Sublime Text 3
 Docs](http://www.sublimetext.com/docs/3/).
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     ```json
     [
         { "keys": ["ctrl+shift+c"], "command": "clang_format" },
     ]
     ```
 
 2. Select some text and press `Ctrl + Shift + C` to format, or select no text to
    format the entire file
 
+## CodeSearch Integration with Chromium X-Refs
+
+With [Chromium X-Refs](https://github.com/karlinjf/ChromiumXRefs/) you can
+perform [https://cs.chromium.org](https://cs.chromium.org] cross-reference
+searches in your editor. This gives you the call graph, overrides, references,
+declaration, and definition of most of the code. The results are as fresh as
+the search engine's index so uncomitted changes won't be reflected.
+
+More information on Chromium X-Ref's functionality (including keyboard and
+mouse shortcuts) can be found on the [Chromium X-Refs
+page](https://github.com/karlinjf/ChromiumXRefs/).
+
+
 ## Code Completion with SublimeClang (Linux Only)
 
 SublimeClang is a powerful autocompletion plugin for Sublime that uses the Clang
 static analyzer to provide real-time type and function completion and
 compilation errors on save. It works with Chromium with a script that finds and
 parses the appropriate *.ninja files to find the necessary include paths for a
 given file.
 
 **Note**: Currently, only the Linux setup of SublimeClang is working. However,
 there are instructions below for Windows/Mac which you are welcome to try -- if
@@ skipping 315 matching lines @@
     *   [Case Conversion](https://packagecontrol.io/packages/Case%20Conversion) -
         automatically changes the case of selected text, e.g. `kConstantName` to
         `CONSTANT_NAME`
     *   [Text Pastry](https://packagecontrol.io/packages/Text%20Pastry) -
         Inserts incremental number sequences with multi-select
     *   [Wrap Plus](https://packagecontrol.io/packages/Wrap%20Plus) - Auto-wraps
         a comment block to 80 columns with `Alt + Q` (was used to write this
         document! ;-)
     *   [Diffy](https://packagecontrol.io/packages/Diffy) - With two files
         opened side-by-side, `Ctrl + k Ctrl + d` will show the differences