Vulcanize MD History to improve page-load performance

docs/vulcanize.md

-# Vulcanizing Material Design downloads
+# Vulcanizing Chrome Polymer UIs
 
 `vulcanize` is an npm module used to combine resources.  In order to make the
-Material Design downloads page sufficiently fast, we run vulcanize on the source
-files to combine them and reduce blocking load/parse time.
+Material Design downloads and history pages sufficiently fast, we run vulcanize
+on the source files to combine them and reduce blocking load/parse time.
 
 ## Required software
 
 Vulcanization currently requires:
 
 - node.js: >= v4.4.2 (can be found with `node --version`)
 - npm: >= 1.3.10 (can be found with `npm --version`)
 - vulcanize: 1.14.8 (can be found with `vulcanize --version`)
 - crisper: 2.0.1 (can be found with `npm list -g crisper`)
 
 ## Installing required software
 
 For instructions on installing node and npm, see
 [here](https://docs.npmjs.com/getting-started/installing-node).
 
 We recommend telling npm where to store downloaded modules:
 
 ```bash
 $ npm config set -g prefix "$HOME/node_modules"
 ```
 
-Then install `crisper` and `vulcanize` like this:
+Then install the required modules:
 
 ```bash
 $ npm install -g crisper vulcanize
 ```
 
 Ultimately, all that is required to run this script is that `crisper` and
 `vulcanize` are on your `$PATH`.
 
 ## Combining resources with vulcanize
 
-To combine all the CSS/HTML/JS for the downloads page to make it production
-fast, you can run the commands:
+To combine all the CSS/HTML/JS for all pages which use vulcanize, making them
+production fast, you can run the command:
 
 ```bash
-$ chrome/browser/resources/md_downloads/vulcanize.py  # from src/
+$ chrome/browser/resources/vulcanize.py  # from src/
 ```
 
 This should overwrite the following files:
 
 - chrome/browser/resources/md_downloads/
  - vulcanized.html (all <link rel=import> and stylesheets inlined)
  - crisper.js (all JavaScript, extracted from vulcanized.html)
+- chrome/browser/resources/md_history/
+ - app.vulcanized.html
+ - app.crisper.js
 
 ## Testing downloads without vulcanizing
 
-Build with "use_vulcanize=0" in your GYP_DEFINES to build downloads without
-vulcanizing.
+Build with `use_vulcanize = false` in your gn args to build without vulcanizing.