Update vscode document

docs/vscode.md

 # Use Visual Studio Code on Chromium code base
 
 [TOC]
 
 [Visual Studio Code](http://code.visualstudio.com/)
 ([Wikipedia](https://en.wikipedia.org/wiki/Visual_Studio_Code)) is a
 multi-platform code editor that is itself based on Electron which is based on 
 Chromium. Visual Studio Code has a growing community and base of installable 
 extensions and themes. It works without too much setup.
 
 ## Install extensions
 
-`ctrl+p` paste `ext install cpptools you-complete-me clang-format` then enter. 
-For more extensions: https://marketplace.visualstudio.com/search?target=vscode
+`F1` paste 
+`ext install cpptools you-complete-me clang-format chromium-codesearch` 
+then enter. For more extensions: 
+https://marketplace.visualstudio.com/search?target=vscode
 
 Highly recommend you also install your favorite keymap. 
 
 An Example to install eclipse keymaps `ext install vscode-eclipse-keybindings`. 
 You can search keymaps here. 
 https://marketplace.visualstudio.com/search?target=vscode&category=Keymaps
 
 
 ## Settings
 
 Open Settings `File/Code - Preferences - Settings` and add the following 
 settings.
 
 ```
 {
   "editor.tabSize": 2,
   "editor.rulers": [80],
+  "[cpp]": {
+    "editor.quickSuggestions": true
+  },
   // Exclude
   "files.exclude": {
     "**/.git": true,
     "**/.svn": true,
     "**/.hg": true,
     "**/.DS_Store": true,
     "**/out": true
   },
   // YCM
   "ycmd.path": "<your_ycmd_path>",
@@ skipping 13 matching lines @@
 $ git clone https://github.com/Valloric/ycmd.git ~/.ycmd
 $ cd ~/.ycmd
 $ ./build.py --clang-completer
 ```
 
 ## Work flow
 
 1. `ctrl+p` open file.
 2. `ctrl+o` goto symbol. `ctrl+l` goto line.
 3. <code>ctrl+`</code> toggle terminal.
+4. `F1` - `CodeSearchOpen` open current line in code search on chrome.
+5. `F1` - `CodeSearchReferences` open XRef Infomation of current symbol.
+6. Use right click menu call `go to definition` or `peek definition`.
+7. Use right click menu call `find all references`.
 
 ## Tips
 
 ### On laptop
 
 Because we use ycmd to enable auto completion. We can disable CPP autocomplete 
-and index to save battery. 
+and index to save battery. We can also disable git status autorefresh to save
+battery.
 
 ```
+"git.autorefresh": false,
 "C_Cpp.autocomplete": "Disabled",
 "C_Cpp.addWorkspaceRootToIncludePath": false
 ```
 
 ### Enable Sublime-like minimap
 
 ```
 "editor.minimap.enabled": true,
 "editor.minimap.renderCharacters": false
 ```
 
 ### More
 
 https://github.com/Microsoft/vscode-tips-and-tricks/blob/master/README.md