Introduce ViewRoot forwarding input/view events to native

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWindowAndroid.java

Index: chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWindowAndroid.java
diff --git a/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWindowAndroid.java b/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWindowAndroid.java
index 99b64bc5d6aa2886b4649dfbc3ccb1b1b9d581d0..9fab3b0af3c7633e20e102da4f7a6fffe9fdc93e 100644
--- a/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWindowAndroid.java
+++ b/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWindowAndroid.java
@@ -28,6 +28,7 @@ import org.chromium.content_public.browser.NavigationController;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.content_public.browser.WebContentsObserver;
 import org.chromium.ui.base.ViewAndroidDelegate;
+import org.chromium.ui.base.ViewRoot;
 import org.chromium.ui.base.WindowAndroid;
 
 /**
@@ -48,6 +49,7 @@ public class CastWindowAndroid extends LinearLayout {
     private WebContents mWebContents;
     private WebContentsObserver mWebContentsObserver;
     private WindowAndroid mWindow;
+    private ViewRoot mViewRoot;
 
     /**
      * Constructor for inflating via XML.
@@ -79,6 +81,10 @@ public class CastWindowAndroid extends LinearLayout {
      */
     public void setWindow(WindowAndroid window) {
         mWindow = window;
+        if (window == null) {
+            mContentViewCore.destroy();
+            mViewRoot.destroy();
+        }
     }
 
     /**
@@ -134,9 +140,10 @@ public class CastWindowAndroid extends LinearLayout {
             String productVersion) {
         Context context = getContext();
         mContentViewCore = new ContentViewCore(context, productVersion);
+        mViewRoot = ViewRoot.create(mWindow);
         ContentView view = ContentView.createContentView(context, mContentViewCore);
         mContentViewCore.initialize(ViewAndroidDelegate.createBasicDelegate(view), view,
-                webContents, mWindow);
+                webContents, mViewRoot);
         mWebContents = mContentViewCore.getWebContents();
         mNavigationController = mWebContents.getNavigationController();
         mRenderProcessId = renderProcessId;