Add support for touch-action: pinch-zoom.

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp

 // Copyright 2015 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.
 
 #include "core/css/parser/CSSPropertyParser.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSBasicShapeValues.h"
 #include "core/css/CSSBorderImage.h"
 #include "core/css/CSSContentDistributionValue.h"
@@ skipping 963 matching lines @@
         return nullptr;
     CSSPrimitiveValue* bottom = consumeClipComponent(args, cssParserMode);
     if (!bottom || (needsComma && !consumeCommaIncludingWhitespace(args)))
         return nullptr;
     CSSPrimitiveValue* left = consumeClipComponent(args, cssParserMode);
     if (!left || !args.atEnd())
         return nullptr;
     return CSSQuadValue::create(top, right, bottom, left, CSSQuadValue::SerializeAsRect);
 }
 
-static bool consumePan(CSSParserTokenRange& range, CSSValue*& panX, CSSValue*& panY)
+static bool consumePan(CSSParserTokenRange& range, CSSValue*& panX, CSSValue*& panY, CSSValue*& pinchZoom)
 {
     CSSValueID id = range.peek().id();
     if ((id == CSSValuePanX || id == CSSValuePanRight || id == CSSValuePanLeft) && !panX) {
         if (id != CSSValuePanX && !RuntimeEnabledFeatures::cssTouchActionPanDirectionsEnabled())
             return false;
         panX = consumeIdent(range);
     } else if ((id == CSSValuePanY || id == CSSValuePanDown || id == CSSValuePanUp) && !panY) {
         if (id != CSSValuePanY && !RuntimeEnabledFeatures::cssTouchActionPanDirectionsEnabled())
             return false;
         panY = consumeIdent(range);
+    } else if (id == CSSValuePinchZoom && !pinchZoom && RuntimeEnabledFeatures::cssTouchActionPinchZoomEnabled()) {
+        pinchZoom = consumeIdent(range);
     } else {
         return false;
     }
     return true;
 }
 
 static CSSValue* consumeTouchAction(CSSParserTokenRange& range)
 {
     CSSValueList* list = CSSValueList::createSpaceSeparated();
     CSSValueID id = range.peek().id();
     if (id == CSSValueAuto || id == CSSValueNone || id == CSSValueManipulation) {
         list->append(*consumeIdent(range));
         return list;
     }
 
     CSSValue* panX = nullptr;
     CSSValue* panY = nullptr;
-    if (!consumePan(range, panX, panY))
+    CSSValue* pinchZoom = nullptr;
+    if (!consumePan(range, panX, panY, pinchZoom))
         return nullptr;
-    if (!range.atEnd() && !consumePan(range, panX, panY))
+    if (!range.atEnd() && !consumePan(range, panX, panY, pinchZoom))
+        return nullptr;
+    if (!range.atEnd() && !consumePan(range, panX, panY, pinchZoom))
         return nullptr;
 
     if (panX)
         list->append(*panX);
     if (panY)
         list->append(*panY);
+    if (pinchZoom)
+        list->append(*pinchZoom);
     return list;
 }
 
 static CSSPrimitiveValue* consumeLineClamp(CSSParserTokenRange& range)
 {
     if (range.peek().type() != PercentageToken && range.peek().type() != NumberToken)
         return nullptr;
     CSSPrimitiveValue* clampValue = consumePercent(range, ValueRangeNonNegative);
     if (clampValue)
         return clampValue;
@@ skipping 3740 matching lines @@
     case CSSPropertyGridTemplate:
         return consumeGridTemplateShorthand(CSSPropertyGridTemplate, important);
     case CSSPropertyGrid:
         return consumeGridShorthand(important);
     default:
         return false;
     }
 }
 
 } // namespace blink