Introduce ViewRoot to forward input/view events to native

content/browser/web_contents/web_contents_android.cc

Index: content/browser/web_contents/web_contents_android.cc
diff --git a/content/browser/web_contents/web_contents_android.cc b/content/browser/web_contents/web_contents_android.cc
index 2d82f680c463f248e4ce78a9815d40ed4f180fcf..ab172f331adc56cfd3a2bfc008153e8624318568 100644
--- a/content/browser/web_contents/web_contents_android.cc
+++ b/content/browser/web_contents/web_contents_android.cc
@@ -23,6 +23,7 @@
 #include "content/browser/media/android/media_web_contents_observer_android.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
+#include "content/browser/web_contents/web_contents_view.h"
 #include "content/common/devtools_messages.h"
 #include "content/common/frame_messages.h"
 #include "content/common/input_messages.h"
@@ -37,6 +38,7 @@
 #include "jni/WebContentsImpl_jni.h"
 #include "net/android/network_library.h"
 #include "ui/accessibility/ax_node_data.h"
+#include "ui/android/view_android.h"
 #include "ui/gfx/android/device_display_info.h"
 #include "ui/gfx/android/java_bitmap.h"
 #include "ui/gfx/geometry/rect.h"
@@ -676,6 +678,13 @@ void WebContentsAndroid::DismissTextHandles(
     view->DismissTextHandles();
 }
 
+jlong WebContentsAndroid::GetEventHandler(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& obj) {
+  return reinterpret_cast<jlong>(
+      web_contents_->GetView()->GetNativeView()->GetEventHandler());
+}
+
 void WebContentsAndroid::OnFinishGetContentBitmap(
     const JavaRef<jobject>& obj,
     const JavaRef<jobject>& callback,