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 17c1ee92fe9bf400800e15466406b4d548069a51..266c7b2d5f847240f813c70379571756d5e924d2 100644
--- a/content/browser/android/in_process/synchronous_input_event_filter.cc
+++ b/content/browser/android/in_process/synchronous_input_event_filter.cc
@@ -5,6 +5,7 @@
 #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"
 
 using WebKit::WebInputEvent;
@@ -42,4 +43,16 @@ void SynchronousInputEventFilter::SetBoundHandlerOnUIThread(
   handler_ = handler;
 }
 
+void SynchronousInputEventFilter::DidAddInputHandler(
+    int routing_id,
+    base::WeakPtr<cc::InputHandler> input_handler) {
+  SynchronousCompositorImpl::FromRoutingID(routing_id)
+      ->SetInputHandler(input_handler);
+}
+
+void SynchronousInputEventFilter::DidRemoveInputHandler(int routing_id) {
+  SynchronousCompositorImpl::FromRoutingID(routing_id)
+      ->SetInputHandler(base::WeakPtr<cc::InputHandler>());
+}
+
 }  // namespace content