Scroll with Layers in views::ScrollView

ui/compositor/compositor.h

 // 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.
 
 #ifndef UI_COMPOSITOR_COMPOSITOR_H_
 #define UI_COMPOSITOR_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 33 matching lines @@
 class LayerTreeHost;
 class RendererSettings;
 class SharedBitmapManager;
 class SurfaceIdAllocator;
 class SurfaceManager;
 class TaskGraphRunner;
 }
 
 namespace gfx {
 class Rect;
+class ScrollOffset;
 class Size;
 }
 
 namespace gpu {
 class GpuMemoryBufferManager;
 struct Mailbox;
 }
 
 namespace ui {
 
@@ skipping 195 matching lines @@
   // Sets the background color used for areas that aren't covered by
   // the |root_layer|.
   void SetBackgroundColor(SkColor color);
 
   // Sets the visibility of the underlying compositor.
   void SetVisible(bool visible);
 
   // Gets the visibility of the underlying compositor.
   bool IsVisible();
 
+  // Gets or sets the scroll offset for the given layer in step with the
+  // cc::InputHandler. Returns true if the layer is active on the impl side.
+  bool GetScrollOffsetForLayer(int layer_id, gfx::ScrollOffset* offset) const;
+  bool ScrollLayerTo(int layer_id, const gfx::ScrollOffset& offset);
+
   // The "authoritative" vsync interval, if provided, will override interval
   // reported from 3D context. This is typically the value reported by a more
   // reliable source, e.g, the platform display configuration.
   // In the particular case of ChromeOS -- this is the value queried through
   // XRandR, which is more reliable than the value queried through the 3D
   // context.
   void SetAuthoritativeVSyncInterval(const base::TimeDelta& interval);
 
   // Sets the widget for the compositor to render into.
   void SetAcceleratedWidget(gfx::AcceleratedWidget widget);
@@ skipping 128 matching lines @@
   scoped_refptr<cc::AnimationTimeline> animation_timeline_;
 
   base::WeakPtrFactory<Compositor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_