Make ViewRoot the top of the ViewAndroid tree

chrome/browser/android/vr_shell/vr_shell.h

Index: chrome/browser/android/vr_shell/vr_shell.h
diff --git a/chrome/browser/android/vr_shell/vr_shell.h b/chrome/browser/android/vr_shell/vr_shell.h
index cc09af90e2b8f1f3693bc61dd016ea6baf7029bd..4ce2d83a0aea4d95b1452313135bb824fdd2f3b2 100644
--- a/chrome/browser/android/vr_shell/vr_shell.h
+++ b/chrome/browser/android/vr_shell/vr_shell.h
@@ -33,7 +33,7 @@ class WebContents;
 }
 
 namespace ui {
-class WindowAndroid;
+class ViewRoot;
 }
 
 namespace vr_shell {
@@ -64,10 +64,11 @@ class VrMetricsHelper;
 // must only be used on the UI thread.
 class VrShell : public device::GvrDelegate, content::WebContentsObserver {
  public:
-  VrShell(JNIEnv* env, jobject obj,
-          ui::WindowAndroid* content_window,
+  VrShell(JNIEnv* env,
+          jobject obj,
+          ui::ViewRoot* content_view_root,
           content::WebContents* ui_contents,
-          ui::WindowAndroid* ui_window,
+          ui::ViewRoot* ui_view_root,
           bool for_web_vr,
           VrShellDelegate* delegate,
           gvr_context* gvr_api,
@@ -196,7 +197,7 @@ class VrShell : public device::GvrDelegate, content::WebContentsObserver {
   bool webvr_mode_ = false;
 
   content::WebContents* main_contents_ = nullptr;
-  ui::WindowAndroid* content_window_;
+  ui::ViewRoot* content_view_root_;
   std::unique_ptr<VrCompositor> content_compositor_;
   content::WebContents* ui_contents_;
   std::unique_ptr<VrCompositor> ui_compositor_;