Add SkColor4f serialization

src/core/SkValidatingReadBuffer.cpp

Index: src/core/SkValidatingReadBuffer.cpp
diff --git a/src/core/SkValidatingReadBuffer.cpp b/src/core/SkValidatingReadBuffer.cpp
index 326d0cf5754f5c66747aa74c53ccb25fabebaf59..0018dbb36f5e58df8f443c8adf4e664b5a0fa898 100644
--- a/src/core/SkValidatingReadBuffer.cpp
+++ b/src/core/SkValidatingReadBuffer.cpp
@@ -110,6 +110,14 @@ void SkValidatingReadBuffer::readString(SkString* string) {
     }
 }
 
+static_assert(SK_SCALAR_IS_FLOAT, "Color4f serialization needs updating");
+void SkValidatingReadBuffer::readColor4f(SkColor4f* color) {
+    color->fR = this->readScalar();
+    color->fG = this->readScalar();
+    color->fB = this->readScalar();
+    color->fA = this->readScalar();
+}
+
 void SkValidatingReadBuffer::readPoint(SkPoint* point) {
     point->fX = this->readScalar();
     point->fY = this->readScalar();
@@ -192,6 +200,10 @@ bool SkValidatingReadBuffer::readColorArray(SkColor* colors, size_t size) {
     return readArray(colors, size, sizeof(SkColor));
 }
 
+bool SkValidatingReadBuffer::readColor4fArray(SkColor4f* colors, size_t size) {
+    return readArray(colors, size, sizeof(SkColor4f));
+}
+
 bool SkValidatingReadBuffer::readIntArray(int32_t* values, size_t size) {
     return readArray(values, size, sizeof(int32_t));
 }