Add BlimpView to a Chrome tab when Blimp is enabled.

ui/android/window_android.cc

Index: ui/android/window_android.cc
diff --git a/ui/android/window_android.cc b/ui/android/window_android.cc
index c53762c15137f715b790a1b2f0f170fc23c10a17..67c6cc1e4dad73072e6e88dc6f7bd723569301b0 100644
--- a/ui/android/window_android.cc
+++ b/ui/android/window_android.cc
@@ -40,15 +40,20 @@ bool WindowAndroid::RegisterWindowAndroid(JNIEnv* env) {
 WindowAndroid::~WindowAndroid() {
   DCHECK(parent_ == nullptr) << "WindowAndroid must be a root view.";
   DCHECK(!compositor_);
+  Java_WindowAndroid_clearNativePointer(AttachCurrentThread(), GetJavaObject());
 }
 
-WindowAndroid* WindowAndroid::createForTesting() {
+WindowAndroid* WindowAndroid::CreateForTesting() {
   JNIEnv* env = AttachCurrentThread();
   const JavaRef<jobject>& context = base::android::GetApplicationContext();
   return new WindowAndroid(
       env, Java_WindowAndroid_createForTesting(env, context).obj());
 }
 
+void WindowAndroid::DestroyForTesting() {
+  delete this;
+}
+
 void WindowAndroid::OnCompositingDidCommit() {
   FOR_EACH_OBSERVER(WindowAndroidObserver,
                     observer_list_,