Add SkColor4f serialization

src/core/SkReadBuffer.cpp

Index: src/core/SkReadBuffer.cpp
diff --git a/src/core/SkReadBuffer.cpp b/src/core/SkReadBuffer.cpp
index 4b9d5987a173607c8d530d44400f7398165f2897..7679622c5839eb2c720a12132a6b9aa5e7600dc4 100644
--- a/src/core/SkReadBuffer.cpp
+++ b/src/core/SkReadBuffer.cpp
@@ -142,6 +142,10 @@ void SkReadBuffer::readString(SkString* string) {
     string->set(strContents, len);
 }
 
+void SkReadBuffer::readColor4f(SkColor4f* color) {
+    memcpy(color, fReader.skip(sizeof(SkColor4f)), sizeof(SkColor4f));
+}
+
 void SkReadBuffer::readPoint(SkPoint* point) {
     point->fX = fReader.readScalar();
     point->fY = fReader.readScalar();
@@ -192,6 +196,10 @@ bool SkReadBuffer::readColorArray(SkColor* colors, size_t size) {
     return readArray(colors, size, sizeof(SkColor));
 }
 
+bool SkReadBuffer::readColor4fArray(SkColor4f* colors, size_t size) {
+    return readArray(colors, size, sizeof(SkColor4f));
+}
+
 bool SkReadBuffer::readIntArray(int32_t* values, size_t size) {
     return readArray(values, size, sizeof(int32_t));
 }