Introduce ViewRoot forwarding input/view events to native

content/shell/android/java/src/org/chromium/content_shell/Shell.java

Index: content/shell/android/java/src/org/chromium/content_shell/Shell.java
diff --git a/content/shell/android/java/src/org/chromium/content_shell/Shell.java b/content/shell/android/java/src/org/chromium/content_shell/Shell.java
index e2f82e34584bb68430d33a6a1396760ae116293b..b9ea81bd609cacc4232095d9ee79432c52124963 100644
--- a/content/shell/android/java/src/org/chromium/content_shell/Shell.java
+++ b/content/shell/android/java/src/org/chromium/content_shell/Shell.java
@@ -37,6 +37,7 @@ import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.NavigationController;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.ui.base.ViewAndroidDelegate;
+import org.chromium.ui.base.ViewRoot;
 import org.chromium.ui.base.WindowAndroid;
 
 /**
@@ -56,6 +57,7 @@ public class Shell extends LinearLayout {
 
     private ContentViewCore mContentViewCore;
     private WebContents mWebContents;
+    private ViewRoot mViewRoot;
     private NavigationController mNavigationController;
     private ContentViewClient mContentViewClient;
     private EditText mUrlTextView;
@@ -301,6 +303,8 @@ public class Shell extends LinearLayout {
         mContentViewCore.setActionModeCallback(defaultActionCallback());
         mContentViewCore.setContentViewClient(mContentViewClient);
         mWebContents = mContentViewCore.getWebContents();
+        mViewRoot = ViewRoot.create(mWindow);
+        mWebContents.initViewRoot(mViewRoot);
         mNavigationController = mWebContents.getNavigationController();
         if (getParent() != null) mContentViewCore.onShow();
         if (mWebContents.getUrl() != null) {
@@ -311,7 +315,7 @@ public class Shell extends LinearLayout {
                         FrameLayout.LayoutParams.MATCH_PARENT,
                         FrameLayout.LayoutParams.MATCH_PARENT));
         cv.requestFocus();
-        mContentViewRenderView.setCurrentContentViewCore(mContentViewCore);
+        mContentViewRenderView.setCurrentContent(mContentViewCore, mViewRoot);
     }
 
     /**
@@ -364,6 +368,13 @@ public class Shell extends LinearLayout {
     }
 
     /**
+     * @return {@link ViewRoot} instance used to forward view/input events.
+     */
+    ViewRoot getViewRoot() {
+        return mViewRoot;
+    }
+
+    /**
      * Enable/Disable navigation(Prev/Next) button if navigation is allowed/disallowed
      * in respective direction.
      * @param controlId Id of button to update