Split out the style-determined direct compositing reasons

Source/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 "wtf/MathExtras.h"
 #include <stdint.h>
 
@@ skipping 70 matching lines @@
     | CompositingReasonTransitionProperty
     | CompositingReasonFilters
     | CompositingReasonPositionFixed
     | CompositingReasonPositionSticky
     | CompositingReasonOverflowScrollingTouch
     | CompositingReasonOverflowScrollingParent
     | CompositingReasonOutOfFlowClipping
     | CompositingReasonVideoOverlay
     | CompositingReasonWillChange;
 
+const uint64_t CompositingReasonComboAllStyleDeterminedDirectReasons =
+    CompositingReason3DTransform
+    | CompositingReasonVideo
+    | CompositingReasonCanvas
+    | CompositingReasonPlugin
+    | CompositingReasonIFrame
+    | CompositingReasonBackfaceVisibilityHidden
+    | CompositingReasonActiveAnimation
+    | CompositingReasonTransitionProperty
+    | CompositingReasonFilters
+    | CompositingReasonVideoOverlay
+    | CompositingReasonWillChange;
+
 const uint64_t CompositingReasonComboReasonsThatRequireOwnBacking =
     CompositingReasonComboAllDirectReasons
     | CompositingReasonOverlap
     | CompositingReasonAssumedOverlap
     | CompositingReasonNegativeZIndexChildren
     | CompositingReasonNoSquashingTargetFound
     | CompositingReasonTransformWithCompositedDescendants
     | CompositingReasonOpacityWithCompositedDescendants
     | CompositingReasonMaskWithCompositedDescendants
     | CompositingReasonFilterWithCompositedDescendants
     | CompositingReasonBlendingWithCompositedDescendants
     | CompositingReasonIsolateCompositedDescendants
     | CompositingReasonPreserve3DWith3DDescendants; // preserve-3d has to create backing store to ensure that 3d-transformed elements intersect.
 
 const uint64_t CompositingReasonComboSquashableReasons =
     CompositingReasonOverlap
     | CompositingReasonAssumedOverlap;
 
 typedef uint64_t CompositingReasons;
 
 struct CompositingReasonStringMap {
     CompositingReasons reason;
     const char* shortName;
     const char* description;
 };
 
+// FIXME: This static data shouldn't be in a header. When it's in the header
+// it's copied into every compilation unit that includes the header.
 static const CompositingReasonStringMap compositingReasonStringMap[] = {
     { CompositingReasonNone,
         "Unknown",
         "No reason given" },
     { CompositingReason3DTransform,
         "transform3D",
         "Has a 3d transform" },
     { CompositingReasonVideo,
         "video",
         "Is an accelerated video" },
@@ skipping 127 matching lines @@
         "layerForMask",
         "Secondary layer, to contain the mask contents" },
     { CompositingReasonLayerForClippingMask,
         "layerForClippingMask",
         "Secondary layer, for clipping mask" }
 };
 
 } // namespace WebCore
 
 #endif // CompositingReasons_h