Removed ScrollingCoordinator and a bunch of composited scrolling'

sky/engine/platform/graphics/CompositingReasons.h

 // Copyright 2014 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 CompositingReasons_h
 #define CompositingReasons_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/MathExtras.h"
 #include <stdint.h>
@@ skipping 33 matching lines @@
 
 // Subtree reasons that require knowing what the status of your subtree is before knowing the answer
 const uint64_t CompositingReasonTransformWithCompositedDescendants       = UINT64_C(1) << 28;
 const uint64_t CompositingReasonOpacityWithCompositedDescendants         = UINT64_C(1) << 29;
 const uint64_t CompositingReasonMaskWithCompositedDescendants            = UINT64_C(1) << 30;
 const uint64_t CompositingReasonFilterWithCompositedDescendants          = UINT64_C(1) << 32;
 const uint64_t CompositingReasonBlendingWithCompositedDescendants        = UINT64_C(1) << 33;
 const uint64_t CompositingReasonClipsCompositingDescendants              = UINT64_C(1) << 34;
 const uint64_t CompositingReasonPerspectiveWith3DDescendants             = UINT64_C(1) << 35;
 const uint64_t CompositingReasonPreserve3DWith3DDescendants              = UINT64_C(1) << 36;
-const uint64_t CompositingReasonIsolateCompositedDescendants             = UINT64_C(1) << 38;
+const uint64_t CompositingReasoWnIsolateCompositedDescendants             = UINT64_C(1) << 38;
 
 // The root layer is a special case that may be forced to be a layer, but also it needs to be
 // a layer if anything else in the subtree is composited.
 const uint64_t CompositingReasonRoot                                     = UINT64_C(1) << 39;
 
 // CompositedLayerMapping internal hierarchy reasons
 const uint64_t CompositingReasonLayerForAncestorClip                     = UINT64_C(1) << 40;
 const uint64_t CompositingReasonLayerForDescendantClip                   = UINT64_C(1) << 41;
 const uint64_t CompositingReasonLayerForPerspective                      = UINT64_C(1) << 42;
-const uint64_t CompositingReasonLayerForHorizontalScrollbar              = UINT64_C(1) << 43;
-const uint64_t CompositingReasonLayerForVerticalScrollbar                = UINT64_C(1) << 44;
+// FIXME(sky): 43 is unused.
+// FIXME(sky): 44 is unused.
 const uint64_t CompositingReasonLayerForOverflowControlsHost             = UINT64_C(1) << 45;
 // FIXME(sky): 46 is unused.
-const uint64_t CompositingReasonLayerForScrollingContents                = UINT64_C(1) << 47;
-const uint64_t CompositingReasonLayerForScrollingContainer               = UINT64_C(1) << 48;
 const uint64_t CompositingReasonLayerForSquashingContents                = UINT64_C(1) << 49;
 const uint64_t CompositingReasonLayerForSquashingContainer               = UINT64_C(1) << 50;
 const uint64_t CompositingReasonLayerForForeground                       = UINT64_C(1) << 51;
 const uint64_t CompositingReasonLayerForBackground                       = UINT64_C(1) << 52;
 const uint64_t CompositingReasonLayerForMask                             = UINT64_C(1) << 53;
 const uint64_t CompositingReasonLayerForClippingMask                     = UINT64_C(1) << 54;
-const uint64_t CompositingReasonLayerForScrollingBlockSelection          = UINT64_C(1) << 55;
+// FIXME(sky): 55 is unused.
 
 // Composited elements with inline transforms trigger assumed overlap so that
 // we can update their transforms quickly.
 const uint64_t CompositingReasonInlineTransform                          = UINT64_C(1) << 56;
 
 // Various combinations of compositing reasons are defined here also, for more intutive and faster bitwise logic.
 const uint64_t CompositingReasonComboAllDirectReasons =
     CompositingReason3DTransform
     | CompositingReasonVideo
     | CompositingReasonCanvas
@@ skipping 77 matching lines @@
     const char* shortName;
     const char* description;
 };
 
 PLATFORM_EXPORT extern const CompositingReasonStringMap kCompositingReasonStringMap[];
 PLATFORM_EXPORT extern size_t kNumberOfCompositingReasons;
 
 } // namespace blink
 
 #endif // CompositingReasons_h