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..088641da640e5e6a45b8455759efdfe460ab96a2 100644
--- a/android_webview/native/aw_contents.cc
+++ b/android_webview/native/aw_contents.cc
@@ -1255,6 +1255,12 @@ void AwContents::ResumeLoadingCreatedPopupWebContents(
   web_contents_->ResumeLoadingCreatedWebContents();
 }
 
+ScopedJavaLocalRef<jobject> AwContents::GetEventHandler(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) {
+  return web_contents_->GetNativeView()->GetEventHandler();
+}
+
 void SetShouldDownloadFavicons(JNIEnv* env,
                                const JavaParamRef<jclass>& jclazz) {
   g_should_download_favicons = true;