Update android docs for how to sync source code

site/user/quick/android.md

Index: site/user/quick/android.md
diff --git a/site/user/quick/android.md b/site/user/quick/android.md
index bffde08b8126c10b56143b5a75b9c9c3faef5244..cf25d6baed3d5c9eb2bda1c800762672951b810c 100644
--- a/site/user/quick/android.md
+++ b/site/user/quick/android.md
@@ -49,6 +49,22 @@ The Android build needs to set up some specific variables needed by both GYP
 and Make. We make this setup easy for developers by encapsulating all the
 details into a custom script that acts as a replacement for make.
 
+Syncing the Source
+-----------------------------
+We use the gclient utility, provided by depot_tools, to sync both our git repository
+as well as any third-party dependencies.  If you are an expert user you can setup
+a .gclient file on your own, but for everyone else it is recommended that you use
+`bin/sync-and-gyp` to create a .gclient file for the first time.
+
+After the initial setup you only need to run `gclient sync` to get the latest
+sources.
+
+Further, we use the open-source gyp tool to generate build files from our
+multi-platform "gyp" files. While most other platforms encourage you to
+regenerate these files using `./gyp_skia` or `bin/sync-and-gyp` it is
+recommended that you do NOT do this for Android.  Instead you can rely
+on it being run automatically by android_ninja.

[scroggo, 2016/04/25 19:02:05]

It's weird that we have a different process here. I'm guessing that
android_ninja supplies options to gyp_skia, so running sync-and-gyp or gyp_skia
will use the default options, which will be overwritten?

FWIW, it seems like the bad way is not that bad - it just means doing some
wasted work. (And I believe gyp_skia is fairly fast.) Or is there some harm to
running gyp_skia?

+
 Custom Android Build Script
 ---------------------------
 
@@ -70,15 +86,6 @@ architecture such as MIPS (generic), x86 (generic) and ARM (generic and device
 specific flavors for Nexus devices). This in turn allows Skia to take
 advantage of specific device optimizations (e.g. NEON instructions).
 
-Generate build file from GYP
-----------------------------
-
-We use the open-source gyp tool to generate build files from our
-multi-platform "gyp" files. While most other platforms enable you to
-regenerate these files using `./gyp_skia` or `bin/sync-and-gyp` it is
-recommended that you do NOT do this for Android.  Instead you can rely
-on it being run automatically by android_ninja.
-
 Faster rebuilds
 ---------------