Delegate root layer scroll offset to android_webview.

content/renderer/gpu/input_handler_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/gpu/input_handler_manager.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "cc/input/input_handler.h"
 #include "content/renderer/gpu/input_event_filter.h"
@@ skipping 73 matching lines @@
   if (input_handlers_.count(routing_id) != 0)
     return;
 
   TRACE_EVENT0("InputHandlerManager::AddInputHandler", "AddingRoute");
   filter_->AddRoute(routing_id);
   input_handlers_[routing_id] =
       make_scoped_refptr(new InputHandlerWrapper(this,
           routing_id, main_loop, input_handler, render_view_impl));
 }
 
+void InputHandlerManager::SetRootLayerScrollDelegate(
+      int routing_id,
+      cc::LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) {
+  message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(
+          &InputHandlerManager::SetRootLayerScrollDelegateOnCompositorThread,
+          base::Unretained(this),
+          routing_id,
+          base::Unretained(root_layer_scroll_offset_delegate)));
+}
+
+void InputHandlerManager::SetRootLayerScrollDelegateOnCompositorThread(
+      int routing_id,
+      cc::LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) {
+  input_handlers_[routing_id]->input_handler_proxy()
+      ->SetRootLayerScrollOffsetDelegate(root_layer_scroll_offset_delegate);
+}
+
 void InputHandlerManager::RemoveInputHandler(int routing_id) {
   DCHECK(message_loop_proxy_->BelongsToCurrentThread());
 
   TRACE_EVENT0("InputHandlerManager::RemoveInputHandler", "RemovingRoute");
 
   filter_->RemoveRoute(routing_id);
   input_handlers_.erase(routing_id);
 }
 
 void InputHandlerManager::HandleInputEvent(
     int routing_id,
     const WebInputEvent* input_event) {
   DCHECK(message_loop_proxy_->BelongsToCurrentThread());
 
   InputHandlerMap::iterator it = input_handlers_.find(routing_id);
   if (it == input_handlers_.end()) {
     TRACE_EVENT0("InputHandlerManager::HandleInputEvent",
                  "NoInputHandlerFound");
     // Oops, we no longer have an interested input handler..
     filter_->DidNotHandleInputEvent(true);
     return;
   }
 
   it->second->input_handler_proxy()->HandleInputEvent(*input_event);
 }
 
 }  // namespace content