mostly working on Android + OTA

Summary:
It works great on iOS, and mostly works on Android, and is now OTA'able as part of the screen config! Haven't done template view yet. One remaining issue:

Layout is borked on Android. I'm guessing the issue has to do with the timing of setting the constraints in `updateRootLayoutSpecs` and calling `mBinding.startSurface` which actually builds the shadow tree. If I try to call `updateRootLayoutSpecs` earlier, it just crashes immediately. Here's the layout it spits out, which clearly has -440 for the x of 420006, which is the RCTText component, causing it to get cut off on the left of the screen:
```
updateLayoutMountItem for reactTag: 420006 x: -440, y: -13, width: 931, height: 78
updateLayoutMountItem for reactTag: 420010 x: 26, y: 79, width: 0, height: 1651
updateLayoutMountItem for reactTag: 420012 x: 0, y: 26, width: 0, height: 158
updateLayoutMountItem for reactTag: 420016 x: 0, y: 210, width: 454, height: 454
updateLayoutMountItem for reactTag: 420018 x: 454, y: 210, width: 455, height: 454
updateLayoutMountItem for reactTag: 420022 x: 0, y: 690, width: 454, height: 454
updateLayoutMountItem for reactTag: 420024 x: 454, y: 690, width: 455, height: 454
updateLayoutMountItem for reactTag: 420028 x: 0, y: 1171, width: 454, height: 454
updateLayoutMountItem for reactTag: 420030 x: 454, y: 1171, width: 455, height: 454
updateLayoutMountItem for reactTag: 420032 x: 0, y: 1651, width: 0, height: 0
```

Reviewed By: mdvacca

Differential Revision: D12813192

fbshipit-source-id: 450d646af4883ff25184141721351da67b091b7c

ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java

@@ -82,6 +82,7 @@ public class ReactRootView extends SizeMonitoringFrameLayout
   private @Nullable ReactInstanceManager mReactInstanceManager;
   private @Nullable String mJSModuleName;
   private @Nullable Bundle mAppProperties;
+  private @Nullable String mInitialUITemplate;
   private @Nullable CustomGlobalLayoutListener mCustomGlobalLayoutListener;
   private @Nullable ReactRootViewEventListener mRootViewEventListener;
   private int mRootViewTag;
@@ -343,6 +344,13 @@ public class ReactRootView extends SizeMonitoringFrameLayout
     startReactApplication(reactInstanceManager, moduleName, null);
   }
 
+  /**
+   * {@see #startReactApplication(ReactInstanceManager, String, android.os.Bundle, String)}
+   */
+  public void startReactApplication(ReactInstanceManager reactInstanceManager, String moduleName, @Nullable Bundle initialProperties) {
+    startReactApplication(reactInstanceManager, moduleName, initialProperties, null);
+  }
+
   /**
    * Schedule rendering of the react component rendered by the JS application from the given JS
    * module (@{param moduleName}) using provided {@param reactInstanceManager} to attach to the
@@ -352,7 +360,8 @@ public class ReactRootView extends SizeMonitoringFrameLayout
   public void startReactApplication(
       ReactInstanceManager reactInstanceManager,
       String moduleName,
-      @Nullable Bundle initialProperties) {
+      @Nullable Bundle initialProperties,
+      @Nullable String initialUITemplate) {
     Systrace.beginSection(TRACE_TAG_REACT_JAVA_BRIDGE, "startReactApplication");
     try {
       UiThreadUtil.assertOnUiThread();
@@ -367,6 +376,7 @@ public class ReactRootView extends SizeMonitoringFrameLayout
       mReactInstanceManager = reactInstanceManager;
       mJSModuleName = moduleName;
       mAppProperties = initialProperties;
+      mInitialUITemplate = initialUITemplate;
 
       if (!mReactInstanceManager.hasStartedCreatingInitialContext()) {
         mReactInstanceManager.createReactContextInBackground();
@@ -449,6 +459,10 @@ public class ReactRootView extends SizeMonitoringFrameLayout
     return mAppProperties;
   }
 
+  public @Nullable String getInitialUITemplate() {
+    return mInitialUITemplate;
+  }
+
   public void setAppProperties(@Nullable Bundle appProperties) {
     UiThreadUtil.assertOnUiThread();
     mAppProperties = appProperties;