Delegate root layer scroll offset to android_webview.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index f16f41365c24cd0b8816781090931e475598f56b..9bba1df834012b527f936189a1aeefc9a3e06d90 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -15,6 +15,7 @@
 #include "cc/base/switches.h"
 #include "cc/base/thread_impl.h"
 #include "cc/debug/layer_tree_debug_state.h"
+#include "cc/input/input_handler.h"
 #include "cc/layers/layer.h"
 #include "cc/trees/layer_tree_host.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
@@ -537,6 +538,11 @@ void RenderWidgetCompositor::DidInitializeOutputSurface(bool success) {
     widget_->webwidget()->didExitCompositingMode();
 }
 
+scoped_ptr<cc::InputHandlerClient>
+RenderWidgetCompositor::CreateInputHandlerClient() {
+  return widget_->CreateInputHandlerClient();
+}
+
 void RenderWidgetCompositor::WillCommit() {
   widget_->InstrumentWillComposite();
 }