Introduce ViewRoot to forward input/view events to native

android_webview/native/aw_contents.cc

Index: android_webview/native/aw_contents.cc
diff --git a/android_webview/native/aw_contents.cc b/android_webview/native/aw_contents.cc
index ccd4ff8c4e00aa932b8c7815ac8ae64671a40ec5..e9ab23c95c00477029148408c850a29a493a8610 100644
--- a/android_webview/native/aw_contents.cc
+++ b/android_webview/native/aw_contents.cc
@@ -1255,6 +1255,11 @@ void AwContents::ResumeLoadingCreatedPopupWebContents(
   web_contents_->ResumeLoadingCreatedWebContents();
 }
 
+jlong AwContents::GetNativeView(JNIEnv* env,
+                                const JavaParamRef<jobject>& obj) {
+  return reinterpret_cast<intptr_t>(web_contents_->GetNativeView());
+}
+
 void SetShouldDownloadFavicons(JNIEnv* env,
                                const JavaParamRef<jclass>& jclazz) {
   g_should_download_favicons = true;