Remove parts of //cc we aren't using

cc/input/input_handler.h

-// Copyright 2011 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 CC_INPUT_INPUT_HANDLER_H_
-#define CC_INPUT_INPUT_HANDLER_H_
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/time/time.h"
-#include "cc/base/cc_export.h"
-#include "cc/input/scrollbar.h"
-#include "cc/trees/swap_promise_monitor.h"
-
-namespace gfx {
-class Point;
-class PointF;
-class Vector2d;
-class Vector2dF;
-}
-
-namespace ui { struct LatencyInfo; }
-
-namespace cc {
-
-class LayerScrollOffsetDelegate;
-class ScrollElasticityHelper;
-
-struct CC_EXPORT InputHandlerScrollResult {
-  InputHandlerScrollResult();
-  // Did any layer scroll as a result this ScrollBy call?
-  bool did_scroll;
-  // Was any of the scroll delta argument to this ScrollBy call not used?
-  bool did_overscroll_root;
-  // The total overscroll that has been accumulated by all ScrollBy calls that
-  // have had overscroll since the last ScrollBegin call. This resets upon a
-  // ScrollBy with no overscroll.
-  gfx::Vector2dF accumulated_root_overscroll;
-  // The amount of the scroll delta argument to this ScrollBy call that was not
-  // used for scrolling.
-  gfx::Vector2dF unused_scroll_delta;
-};
-
-class CC_EXPORT InputHandlerClient {
- public:
-  virtual ~InputHandlerClient() {}
-
-  virtual void WillShutdown() = 0;
-  virtual void Animate(base::TimeTicks time) = 0;
-  virtual void MainThreadHasStoppedFlinging() = 0;
-  virtual void ReconcileElasticOverscrollAndRootScroll() = 0;
-
- protected:
-  InputHandlerClient() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(InputHandlerClient);
-};
-
-// The InputHandler is a way for the embedders to interact with the impl thread
-// side of the compositor implementation. There is one InputHandler per
-// LayerTreeHost. To use the input handler, implement the InputHanderClient
-// interface and bind it to the handler on the compositor thread.
-class CC_EXPORT InputHandler {
- public:
-  // Note these are used in a histogram. Do not reorder or delete existing
-  // entries.
-  enum ScrollStatus {
-    SCROLL_ON_MAIN_THREAD = 0,
-    SCROLL_STARTED,
-    SCROLL_IGNORED,
-    SCROLL_UNKNOWN,
-    // This must be the last entry.
-    ScrollStatusCount
-  };
-  enum ScrollInputType { GESTURE, WHEEL, NON_BUBBLING_GESTURE };
-
-  // Binds a client to this handler to receive notifications. Only one client
-  // can be bound to an InputHandler. The client must live at least until the
-  // handler calls WillShutdown() on the client.
-  virtual void BindToClient(InputHandlerClient* client) = 0;
-
-  // Selects a layer to be scrolled at a given point in viewport (logical
-  // pixel) coordinates. Returns SCROLL_STARTED if the layer at the coordinates
-  // can be scrolled, SCROLL_ON_MAIN_THREAD if the scroll event should instead
-  // be delegated to the main thread, or SCROLL_IGNORED if there is nothing to
-  // be scrolled at the given coordinates.
-  virtual ScrollStatus ScrollBegin(const gfx::Point& viewport_point,
-                                   ScrollInputType type) = 0;
-
-  virtual ScrollStatus ScrollAnimated(const gfx::Point& viewport_point,
-                                      const gfx::Vector2dF& scroll_delta) = 0;
-
-  // Scroll the selected layer starting at the given position. If the scroll
-  // type given to ScrollBegin was a gesture, then the scroll point and delta
-  // should be in viewport (logical pixel) coordinates. Otherwise they are in
-  // scrolling layer's (logical pixel) space. If there is no room to move the
-  // layer in the requested direction, its first ancestor layer that can be
-  // scrolled will be moved instead. The return value's |did_scroll| field is
-  // set to false if no layer can be moved in the requested direction at all,
-  // and set to true if any layer is moved.
-  // If the scroll delta hits the root layer, and the layer can no longer move,
-  // the root overscroll accumulated within this ScrollBegin() scope is reported
-  // in the return value's |accumulated_overscroll| field.
-  // Should only be called if ScrollBegin() returned SCROLL_STARTED.
-  virtual InputHandlerScrollResult ScrollBy(
-      const gfx::Point& viewport_point,
-      const gfx::Vector2dF& scroll_delta) = 0;
-
-  virtual bool ScrollVerticallyByPage(const gfx::Point& viewport_point,
-                                      ScrollDirection direction) = 0;
-
-  // Returns SCROLL_STARTED if a layer was being actively being scrolled,
-  // SCROLL_IGNORED if not.
-  virtual ScrollStatus FlingScrollBegin() = 0;
-
-  virtual void MouseMoveAt(const gfx::Point& mouse_position) = 0;
-
-  // Stop scrolling the selected layer. Should only be called if ScrollBegin()
-  // returned SCROLL_STARTED.
-  virtual void ScrollEnd() = 0;
-
-  virtual void SetRootLayerScrollOffsetDelegate(
-      LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) = 0;
-
-  // Called when the value returned by
-  // LayerScrollOffsetDelegate.GetTotalScrollOffset has changed for reasons
-  // other than a SetTotalScrollOffset call.
-  // NOTE: This should only called after a valid delegate was set via a call to
-  // SetRootLayerScrollOffsetDelegate.
-  virtual void OnRootLayerDelegatedScrollOffsetChanged() = 0;
-
-  virtual void PinchGestureBegin() = 0;
-  virtual void PinchGestureUpdate(float magnify_delta,
-                                  const gfx::Point& anchor) = 0;
-  virtual void PinchGestureEnd() = 0;
-
-  // Request another callback to InputHandlerClient::Animate().
-  virtual void SetNeedsAnimate() = 0;
-
-  // Whether the layer under |viewport_point| is the currently scrolling layer.
-  virtual bool IsCurrentlyScrollingLayerAt(const gfx::Point& viewport_point,
-                                           ScrollInputType type) = 0;
-
-  virtual bool HaveWheelEventHandlersAt(const gfx::Point& viewport_point) = 0;
-
-  // Whether the page should be given the opportunity to suppress scrolling by
-  // consuming touch events that started at |viewport_point|.
-  virtual bool DoTouchEventsBlockScrollAt(const gfx::Point& viewport_point) = 0;
-
-  // Calling CreateLatencyInfoSwapPromiseMonitor() to get a scoped
-  // LatencyInfoSwapPromiseMonitor. During the life time of the
-  // LatencyInfoSwapPromiseMonitor, if SetNeedsRedraw() or SetNeedsRedrawRect()
-  // is called on LayerTreeHostImpl, the original latency info will be turned
-  // into a LatencyInfoSwapPromise.
-  virtual scoped_ptr<SwapPromiseMonitor> CreateLatencyInfoSwapPromiseMonitor(
-      ui::LatencyInfo* latency) = 0;
-
-  virtual ScrollElasticityHelper* CreateScrollElasticityHelper() = 0;
-
- protected:
-  InputHandler() {}
-  virtual ~InputHandler() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(InputHandler);
-};
-
-}  // namespace cc
-
-#endif  // CC_INPUT_INPUT_HANDLER_H_