Add documentation for SimpleRecyclerViewAdapter usage

Change-Id: I96d4b52033828c8e9bb62fc184827da20bbe7b9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732795Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684011}

docs/ui/android/mvc_simple_list_tutorial.md

@@ -8,7 +8,8 @@ In this example we'll be creating a simple menu list where each list item consis
 label.
 
 ### Additional Resources
-[Introductory MVC tutorial][mvc_tutorial_link]
+* [Introductory MVC tutorial][mvc_tutorial_link]
+* [Expanding to RecyclerViews in MVC][mvc_recycler_view_tutorial]
 
 ### File Structure
 The file structure of our component will be the following:
@@ -168,4 +169,5 @@ class SimpleMenuItemViewBinder {
 ```
 
 [mvc_tutorial_link]:https://chromium.googlesource.com/chromium/src/+/HEAD/docs/ui/android/mvc_architecture_tutorial.md
+[Expanding to RecyclerViews in MVC]:https://chromium.googlesource.com/chromium/src/+/HEAD/docs/ui/android/mvc_simple_recycler_view__tutorial.md
 

docs/ui/android/mvc_simple_recycler_view_tutorial.md

+# Simple RecyclerView use in MVC
+
+### Overview
+This tutorial briefly describes the use of ```RecyclerViews``` in an MVC component. For the
+prerequisites to this tutorial, see [Additional Resources](#Additional-Resources).
+
+Using ```RecyclerViews``` in a basic way in MVC is now very similar to how basic non-recycler
+lists work. The general flow is as follows:
+* Build and maintain a [```ModelList```][model_list_link].
+* Create a [```SimpleRecyclerViewAdapter```][simple_rva_link].
+* Register each type of view with the adapter.
+* Clean up recycled views if necessary.
+
+Both the ```ModelListAdapter``` and the ```SimpleRecyclerViewAdapter```  implement the
+```MVCListAdapter``` interface. That is to say that usage of the two adapters is roughly identical.
+The main reason to use one or the other is dependent on the capabilities needed by the views that
+each adapter is attached to. Changing from using a ```ListView``` to a ```RecyclerView``` should be
+simple once the adapter is implemented.
+
+### Additional Resources
+* [Introductory MVC tutorial][mvc_tutorial_link]
+* [Simple MVC list tutorial][mvc_list_tutorial_link]
+
+### Instantiating a ```SimpleRecyclerViewAdapter```
+
+A ```SimpleRecyclerViewAdapter``` is instantiated the same way a ```ModelListAdapter``` is; you
+only need to provide a handle to the ```ModelList``` for the data the view will display.
+
+### Fast view lookup
+Typical usage of ```RecyclerView``` requires the creation of a ```ViewHolder``` to cache the views
+that frequently have new content bound to them. The ```SimpleRecyclerViewAdapter``` does away with
+this concept.
+
+A generic solution to fast view lookup can be found in
+[```ViewLookupCachingFrameLayout```][fast_lookup_frame_layout_link]. This version of a
+```FrameLayout``` exposes a method: ```fastFindViewById```. The added method attempts to find the
+specified view, and if it exists, it will be cached for faster lookups. See the full documentation
+for this class [here][fast_lookup_frame_layout_link].
+
+### Cleaning up a recycled view
+In some cases complex views can hold on to expensive resources; the most common cases is holding a
+reference to a large bitmap. The ```SimpleRecyclerViewAdapter``` does not explicitly provide a way
+to do resource cleanup, but this can still be achieved with ```RecyclerView#RecyclerListener```.
+
+```java
+recyclerListener = (holder) -> {
+    // Do cleanup for |holder| here. The root view can be accessed via |holder#itemView|
+};
+
+// Optionally the listener can be defined in-line below.
+mRecyclerView.setRecyclerListener(recyclerListener);
+
+````
+
+[model_list_link]:(https://codesearch.chromium.org/chromium/src/ui/android/java/src/org/chromium/ui/modelutil/MVCListAdapter.java?rcl=d22c9731463bad77645cb0f1a928dec7da79bff9&l=38)
+[simple_rva_link]:(https://codesearch.chromium.org/chromium/src/ui/android/java/src/org/chromium/ui/modelutil/SimpleRecyclerViewAdapter.java)
+[mvc_tutorial_link]:https://chromium.googlesource.com/chromium/src/+/HEAD/docs/ui/android/mvc_architecture_tutorial.md
+[mvc_list_tutorial_link]:https://chromium.googlesource.com/chromium/src/+/HEAD/docs/ui/android/mvc_simple_list_tutorial.md
+[fast_lookup_frame_layout_link]:https://codesearch.chromium.org/chromium/src/ui/android/java/src/org/chromium/ui/widget/ViewLookupCachingFrameLayout.java
+