Add SkColor4f serialization

src/core/SkWriteBuffer.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkWriteBuffer.h"
 #include "SkBitmap.h"
 #include "SkData.h"
@@ skipping 60 matching lines @@
 
 void SkBinaryWriteBuffer::writeColor(SkColor color) {
     fWriter.write32(color);
 }
 
 void SkBinaryWriteBuffer::writeColorArray(const SkColor* color, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(color, count * sizeof(SkColor));
 }
 
+void SkBinaryWriteBuffer::writeColor4f(const SkColor4f& color) {
+    fWriter.write(&color, sizeof(SkColor4f));
+}
+
+void SkBinaryWriteBuffer::writeColor4fArray(const SkColor4f* color, uint32_t count) {
+    fWriter.write32(count);
+    fWriter.write(color, count * sizeof(SkColor4f));
+}
+
 void SkBinaryWriteBuffer::writePoint(const SkPoint& point) {
     fWriter.writeScalar(point.fX);
     fWriter.writeScalar(point.fY);
 }
 
 void SkBinaryWriteBuffer::writePointArray(const SkPoint* point, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(point, count * sizeof(SkPoint));
 }
 
@@ skipping 195 matching lines @@
     // make room for the size of the flattened object
     (void)fWriter.reserve(sizeof(uint32_t));
     // record the current size, so we can subtract after the object writes.
     size_t offset = fWriter.bytesWritten();
     // now flatten the object
     flattenable->flatten(*this);
     size_t objSize = fWriter.bytesWritten() - offset;
     // record the obj's size
     fWriter.overwriteTAt(offset - sizeof(uint32_t), SkToU32(objSize));
 }