Let LayerTreeHostImpl::ScrollAnimated scroll the outer viewport.

content/renderer/input/input_handler_proxy_unittest.cc

 // Copyright 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/input/input_handler_proxy.h"
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/trees/swap_promise_monitor.h"
 #include "content/common/input/did_overscroll_params.h"
@@ skipping 120 matching lines @@
                      bool(const gfx::Point& point,
                           cc::InputHandler::ScrollInputType type));
 
   MOCK_METHOD1(HaveWheelEventHandlersAt, bool(const gfx::Point& point));
   MOCK_METHOD1(DoTouchEventsBlockScrollAt, bool(const gfx::Point& point));
 
   MOCK_METHOD0(RequestUpdateForSynchronousInputHandler, void());
   MOCK_METHOD1(SetSynchronousInputHandlerRootScrollOffset,
                void(const gfx::ScrollOffset& root_offset));
 
-  bool IsCurrentlyScrollingRoot() const override { return is_scrolling_root_; }
+  bool IsCurrentlyScrollingInnerViewport() const override {
+    return is_scrolling_root_;
+  }
   void set_is_scrolling_root(bool is) { is_scrolling_root_ = is; }
 
  private:
   bool is_scrolling_root_ = true;
   DISALLOW_COPY_AND_ASSIGN(MockInputHandler);
 };
 
 class MockSynchronousInputHandler : public content::SynchronousInputHandler {
  public:
   MOCK_METHOD0(SetNeedsSynchronousAnimateInput, void());
@@ skipping 2264 matching lines @@
   testing::Mock::VerifyAndClearExpectations(&mock_client);
   testing::Mock::VerifyAndClearExpectations(&mock_synchronous_input_handler);
 }
 
 INSTANTIATE_TEST_CASE_P(AnimateInput,
                         InputHandlerProxyTest,
                         testing::ValuesIn(test_types));
 
 } // namespace
 } // namespace content