Closure Compiler: Add script to run compile and update Wiki docs.

docs/closure_compilation.md

 # Closure Compilation
 
 ## I just need to fix the compile!
 
 ### Pre-requisites
 
 You'll need Java 7 (preferably the OpenJDK version).  To install on Ubuntu:
 
 ```shell
 sudo apt-get install openjdk-7-jre
 ```
 
 On Mac or Windows, visit:
 [http://www.oracle.com/technetwork/java/javase/downloads/index.html](http://www.oracle.com/technetwork/java/javase/downloads/index.html)
 
 ### Using ninja to compile the code
 
-We use GYP and ninja as our build system. To generate the ninja files from GYP:
+To compile the JavaScript, run this script:
 
 ```shell
-# notice the 2 in compiled_resources2.gyp
-GYP_GENERATORS=ninja tools/gyp/gyp --depth . third_party/closure_compiler/compiled_resources2.gyp
-```
-
-To compile the JavaScript:
-
-```shell
-ninja -C out/Default -j4
+third_party/closure_compiler/run_compiler
 ```
 
 The output should look something like this:
 
 ```shell
 ninja: Entering directory `out/Default/'
 [30/106] ACTION Compiling chrome/browser/resources/md_history/constants.js
 ```
 
-To generate and run the **deprecated** v1 gyp format, remove the "2" from "compiled_resources2.gyp":
+To compile only a specific target, add an argument after the script name:
 
 ```shell
-$ GYP_GENERATORS=ninja tools/gyp/gyp --depth . third_party/closure_compiler/compiled_resources.gyp
-```
-
-Compiling works the same way for both v1 and v2 systems:
-
-```shell
-ninja -C out/Default -j4
+third_party/closure_compiler/run_compiler people_page
 ```
 
 ## Background
 
 In C++ and Java, compiling the code gives you _some_ level of protection against
 misusing variables based on their type information. JavaScript is loosely typed
 and therefore doesn't offer this safety. This makes writing JavaScript more
 error prone as it's _one more thing_ to mess up.
 
 Because having this safety is handy, Chrome now has a way to optionally
@@ skipping 245 matching lines @@
           'jscomp_error=duplicate',
           'jscomp_error=misplacedTypeAnnotation',
         ],
         'disabled_closure_args': [], # remove the disabled closure args for more strict compilation
       },
       'includes': ['../third_party/closure_compiler/compile_js.gypi'],
     },
   ],
 }
 ```