Delegate root layer scroll offset to android_webview.

content/browser/android/in_process/synchronous_input_event_filter.cc

Index: content/browser/android/in_process/synchronous_input_event_filter.cc
diff --git a/content/browser/android/in_process/synchronous_input_event_filter.cc b/content/browser/android/in_process/synchronous_input_event_filter.cc
index 75bf352fa2cce9da3a7efa3aa6648f1674e6fb07..4abf0c88e147720373e7a62347381194a92ded55 100644
--- a/content/browser/android/in_process/synchronous_input_event_filter.cc
+++ b/content/browser/android/in_process/synchronous_input_event_filter.cc
@@ -4,6 +4,8 @@
 
 #include "content/browser/android/in_process/synchronous_input_event_filter.h"
 
+#include "base/callback.h"
+#include "content/browser/android/in_process/synchronous_compositor_impl.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/base/latency_info.h"
 
@@ -42,4 +44,16 @@ void SynchronousInputEventFilter::SetBoundHandlerOnUIThread(
   handler_ = handler;
 }
 
+void SynchronousInputEventFilter::DidAddInputHandler(
+    int routing_id,
+    cc::InputHandler* input_handler) {
+  SynchronousCompositorImpl::FromRoutingID(routing_id)
+      ->SetInputHandler(input_handler);
+}
+
+void SynchronousInputEventFilter::DidRemoveInputHandler(int routing_id) {
+  SynchronousCompositorImpl::FromRoutingID(routing_id)
+      ->SetInputHandler(NULL);
+}
+
 }  // namespace content