Deprecate step timing with position 'middle'

third_party/WebKit/Source/core/css/resolver/CSSToStyleMap.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
@@ skipping 22 matching lines @@
 #include "core/animation/css/CSSAnimationData.h"
 #include "core/css/CSSBorderImageSliceValue.h"
 #include "core/css/CSSCustomIdentValue.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSPrimitiveValueMappings.h"
 #include "core/css/CSSQuadValue.h"
 #include "core/css/CSSTimingFunctionValue.h"
 #include "core/css/CSSValuePair.h"
 #include "core/css/resolver/StyleBuilderConverter.h"
 #include "core/css/resolver/StyleResolverState.h"
+#include "core/frame/Deprecation.h"
 #include "core/style/BorderImageLengthBox.h"
 #include "core/style/FillLayer.h"
 
 namespace blink {
 
 void CSSToStyleMap::MapFillAttachment(StyleResolverState&,
                                       FillLayer* layer,
                                       const CSSValue& value) {
   if (value.IsInitialValue()) {
     layer->SetAttachment(FillLayer::InitialFillAttachment(layer->GetType()));
@@ skipping 348 matching lines @@
           custom_ident_value.ValueAsPropertyID());
     return CSSTransitionData::TransitionProperty(custom_ident_value.Value());
   }
   DCHECK_EQ(ToCSSIdentifierValue(value).GetValueID(), CSSValueNone);
   return CSSTransitionData::TransitionProperty(
       CSSTransitionData::kTransitionNone);
 }
 
 PassRefPtr<TimingFunction> CSSToStyleMap::MapAnimationTimingFunction(
     const CSSValue& value,
-    bool allow_step_middle) {
+    bool allow_step_middle,
+    Document* document) {
   // FIXME: We should probably only call into this function with a valid
   // single timing function value which isn't initial or inherit. We can
   // currently get into here with initial since the parser expands unset
   // properties in shorthands to initial.
 
   if (value.IsIdentifierValue()) {
     const CSSIdentifierValue& identifier_value = ToCSSIdentifierValue(value);
     switch (identifier_value.GetValueID()) {
       case CSSValueLinear:
         return LinearTimingFunction::Shared();
       case CSSValueEase:
         return CubicBezierTimingFunction::Preset(
             CubicBezierTimingFunction::EaseType::EASE);
       case CSSValueEaseIn:
         return CubicBezierTimingFunction::Preset(
             CubicBezierTimingFunction::EaseType::EASE_IN);
       case CSSValueEaseOut:
         return CubicBezierTimingFunction::Preset(
             CubicBezierTimingFunction::EaseType::EASE_OUT);
       case CSSValueEaseInOut:
         return CubicBezierTimingFunction::Preset(
             CubicBezierTimingFunction::EaseType::EASE_IN_OUT);
       case CSSValueStepStart:
         return StepsTimingFunction::Preset(
             StepsTimingFunction::StepPosition::START);
       case CSSValueStepMiddle:
-        if (allow_step_middle)
+        if (allow_step_middle) {
+          DCHECK(document);
+          if (document) {
+            Deprecation::CountDeprecation(
+                *document, WebFeature::kDeprecatedTimingFunctionStepMiddle);
+          }
           return StepsTimingFunction::Preset(
               StepsTimingFunction::StepPosition::MIDDLE);
+        }
         return CSSTimingData::InitialTimingFunction();
       case CSSValueStepEnd:
         return StepsTimingFunction::Preset(
             StepsTimingFunction::StepPosition::END);
       default:
         NOTREACHED();
         return CSSTimingData::InitialTimingFunction();
     }
   }
 
@@ skipping 11 matching lines @@
   if (value.IsFramesTimingFunctionValue()) {
     const CSSFramesTimingFunctionValue& frames_timing_function =
         ToCSSFramesTimingFunctionValue(value);
     return FramesTimingFunction::Create(
         frames_timing_function.NumberOfFrames());
   }
 
   const CSSStepsTimingFunctionValue& steps_timing_function =
       ToCSSStepsTimingFunctionValue(value);
   if (steps_timing_function.GetStepPosition() ==
-          StepsTimingFunction::StepPosition::MIDDLE &&
-      !allow_step_middle)
-    return CSSTimingData::InitialTimingFunction();
+      StepsTimingFunction::StepPosition::MIDDLE) {
+    if (!allow_step_middle) {
+      return CSSTimingData::InitialTimingFunction();
+    }
+    DCHECK(document);
+    if (document) {
+      Deprecation::CountDeprecation(
+          *document, WebFeature::kDeprecatedTimingFunctionStepMiddle);
+    }
+  }
   return StepsTimingFunction::Create(steps_timing_function.NumberOfSteps(),
                                      steps_timing_function.GetStepPosition());
 }
 
 void CSSToStyleMap::MapNinePieceImage(StyleResolverState& state,
                                       CSSPropertyID property,
                                       const CSSValue& value,
                                       NinePieceImage& image) {
   // If we're not a value list, then we are "none" and don't need to alter the
   // empty image at all.
@@ skipping 165 matching lines @@
       vertical_rule = kSpaceImageRule;
       break;
     default:  // CSSValueRepeat
       vertical_rule = kRepeatImageRule;
       break;
   }
   image.SetVerticalRule(vertical_rule);
 }
 
 }  // namespace blink