Implement desktop compatibility viewport

cc/layer_impl.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_LAYER_IMPL_H_
 #define CC_LAYER_IMPL_H_
 
 #include <string>
 
 #include "base/logging.h"
@@ skipping 211 matching lines @@
 
     const gfx::Vector2dF& scrollDelta() const { return m_scrollDelta; }
     void setScrollDelta(const gfx::Vector2dF&);
 
     const gfx::Transform& implTransform() const { return m_implTransform; }
     void setImplTransform(const gfx::Transform& transform);
 
     const gfx::Vector2d& sentScrollDelta() const { return m_sentScrollDelta; }
     void setSentScrollDelta(const gfx::Vector2d& sentScrollDelta);
 
+    const gfx::Vector2d& desktopCompatibilityViewportOffsetFromScrollPosition() { return m_desktopCompatibilityViewportOffsetFromScrollPosition; }
+    void setDesktopCompatibilityViewportOffsetFromScrollPosition(const gfx::Vector2d& desktopCompatibilityViewportOffsetFromScrollPosition) { m_desktopCompatibilityViewportOffsetFromScrollPosition = desktopCompatibilityViewportOffsetFromScrollPosition; }
+
+    const gfx::Vector2dF& desktopCompatibilityViewportOffsetFromScrollPositionDelta() { return m_desktopCompatibilityViewportOffsetFromScrollPositionDelta; }
+    void setDesktopCompatibilityViewportOffsetFromScrollPositionDelta(const gfx::Vector2dF& desktopCompatibilityViewportOffsetFromScrollPositionDelta) { m_desktopCompatibilityViewportOffsetFromScrollPositionDelta = desktopCompatibilityViewportOffsetFromScrollPositionDelta; }
+
+    const gfx::Vector2d& sentDesktopCompatibilityViewportOffsetFromScrollPositionDelta() { return m_sentDesktopCompatibilityViewportOffsetFromScrollPositionDelta; }
+    void setSentDesktopCompatibilityViewportOffsetFromScrollPositionDelta(const gfx::Vector2d& sentDesktopCompatibilityViewportOffsetFromScrollPositionDelta) { m_sentDesktopCompatibilityViewportOffsetFromScrollPositionDelta = sentDesktopCompatibilityViewportOffsetFromScrollPositionDelta; }
+
     // Returns the delta of the scroll that was outside of the bounds of the initial scroll
     gfx::Vector2dF scrollBy(const gfx::Vector2dF& scroll);
 
     bool scrollable() const { return m_scrollable; }
     void setScrollable(bool scrollable) { m_scrollable = scrollable; }
 
     bool shouldScrollOnMainThread() const { return m_shouldScrollOnMainThread; }
     void setShouldScrollOnMainThread(bool shouldScrollOnMainThread) { m_shouldScrollOnMainThread = shouldScrollOnMainThread; }
 
     bool haveWheelEventHandlers() const { return m_haveWheelEventHandlers; }
@@ skipping 142 matching lines @@
     // Set for the layer that other layers are fixed to.
     bool m_isContainerForFixedPositionLayers;
     // This is true if the layer should be fixed to the closest ancestor container.
     bool m_fixedToContainerLayer;
 
     gfx::Vector2dF m_scrollDelta;
     gfx::Vector2d m_sentScrollDelta;
     gfx::Vector2d m_maxScrollOffset;
     gfx::Transform m_implTransform;
     gfx::Vector2dF m_lastScrollOffset;
+    // For root scroll layer only.
+    gfx::Vector2d m_desktopCompatibilityViewportOffsetFromScrollPosition;
+    gfx::Vector2dF m_desktopCompatibilityViewportOffsetFromScrollPositionDelta;
+    gfx::Vector2d m_sentDesktopCompatibilityViewportOffsetFromScrollPositionDelta;
 
     // The global depth value of the center of the layer. This value is used
     // to sort layers from back to front.
     float m_drawDepth;
 
     // Debug layer name.
     std::string m_debugName;
 
     WebKit::WebFilterOperations m_filters;
     WebKit::WebFilterOperations m_backgroundFilters;
@@ skipping 22 matching lines @@
     // Group of properties that need to be computed based on the layer tree
     // hierarchy before layers can be drawn.
     DrawProperties<LayerImpl, RenderSurfaceImpl> m_drawProperties;
 
     DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }
 
 #endif  // CC_LAYER_IMPL_H_