Put CSSCrossfadeValue into the blink::cssvalue namespace.

Bug: 667961
Change-Id: Ifed211edbc99290178daf60c39c7ff0e013213b7
Reviewed-on: https://chromium-review.googlesource.com/558308
Commit-Queue: Stuart Langley <slangley@chromium.org>
Reviewed-by: meade_UTC10 <meade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485179}

third_party/WebKit/Source/core/animation/CSSImageInterpolationType.cpp

@@ -38,7 +38,7 @@ class CSSImageNonInterpolableValue : public NonInterpolableValue {
       return start_;
     if (progress >= 1)
       return end_;
-    return CSSCrossfadeValue::Create(
+    return cssvalue::CSSCrossfadeValue::Create(
         start_, end_,
         CSSPrimitiveValue::Create(progress,
                                   CSSPrimitiveValue::UnitType::kNumber));

third_party/WebKit/Source/core/css/CSSCrossfadeValue.cpp

@@ -33,6 +33,7 @@
 #include "platform/wtf/text/StringBuilder.h"
 
 namespace blink {
+namespace cssvalue {
 
 static bool SubimageIsPending(CSSValue* value) {
   if (value->IsImageValue())
@@ -302,4 +303,5 @@ DEFINE_TRACE_AFTER_DISPATCH(CSSCrossfadeValue) {
   CSSImageGeneratorValue::TraceAfterDispatch(visitor);
 }
 
+}  // namespace cssvalue
 }  // namespace blink

third_party/WebKit/Source/core/css/CSSCrossfadeValue.h

@@ -37,8 +37,10 @@ namespace blink {
 
 class CrossfadeSubimageObserverProxy;
 
+namespace cssvalue {
+
 class CORE_EXPORT CSSCrossfadeValue final : public CSSImageGeneratorValue {
-  friend class CrossfadeSubimageObserverProxy;
+  friend class blink::CrossfadeSubimageObserverProxy;
   USING_PRE_FINALIZER(CSSCrossfadeValue, Dispose);
 
  public:
@@ -116,6 +118,7 @@ class CORE_EXPORT CSSCrossfadeValue final : public CSSImageGeneratorValue {
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCrossfadeValue, IsCrossfadeValue());
 
+}  // namespace cssvalue
 }  // namespace blink
 
 #endif  // CSSCrossfadeValue_h

third_party/WebKit/Source/core/css/CSSImageGeneratorValue.cpp

@@ -33,6 +33,8 @@
 
 namespace blink {
 
+using cssvalue::ToCSSCrossfadeValue;
+
 CSSImageGeneratorValue::CSSImageGeneratorValue(ClassType class_type)
     : CSSValue(class_type) {}