Delegate root layer scroll offset to android_webview.

content/renderer/android/synchronous_compositor_input_handler_client_wrapper.cc

+// Copyright (c) 2013 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/android/synchronous_compositor_input_handler_client_wrapper.h"
+
+#include "cc/input/layer_scroll_offset_delegate.h"
+
+namespace content {
+
+SynchronousCompositorInputHandlerClientWrapper::
+    SynchronousCompositorInputHandlerClientWrapper(
+        scoped_ptr<cc::InputHandlerClient> wrapped_client,
+        cc::LayerScrollOffsetDelegate* layer_scroll_offset_delegate)
+    : wrapped_client_(wrapped_client.Pass()),
+      layer_scroll_offset_delegate_(layer_scroll_offset_delegate),
+      handler_(NULL) {}
+
+SynchronousCompositorInputHandlerClientWrapper::
+    ~SynchronousCompositorInputHandlerClientWrapper() {
+  handler_->SetRootLayerScrollOffsetDelegate(NULL);
+}
+
+void SynchronousCompositorInputHandlerClientWrapper::BindToHandler(
+    cc::InputHandler* handler) {
+  wrapped_client_->BindToHandler(handler);
+  handler_ = handler;
+  handler_->SetRootLayerScrollOffsetDelegate(layer_scroll_offset_delegate_);
+}
+
+void SynchronousCompositorInputHandlerClientWrapper::Animate(
+    base::TimeTicks time) {
+  wrapped_client_->Animate(time);
+}
+
+void
+SynchronousCompositorInputHandlerClientWrapper::MainThreadHasStoppedFlinging() {
+  wrapped_client_->MainThreadHasStoppedFlinging();
+}
+
+}  // namespace content