Refactor read and write buffers.

src/effects/SkLerpXfermode.cpp

Index: src/effects/SkLerpXfermode.cpp
diff --git a/src/effects/SkLerpXfermode.cpp b/src/effects/SkLerpXfermode.cpp
index d73ecf4c5771bd425d6104ec2a51a86c700ec6f1..505ada0b9a022dca90f875ee1f84e33c596e6ef6 100644
--- a/src/effects/SkLerpXfermode.cpp
+++ b/src/effects/SkLerpXfermode.cpp
@@ -7,7 +7,8 @@
 
 #include "SkLerpXfermode.h"
 #include "SkColorPriv.h"
-#include "SkFlattenableBuffers.h"
+#include "SkReadBuffer.h"
+#include "SkWriteBuffer.h"
 #include "SkString.h"
 
 SkXfermode* SkLerpXfermode::Create(SkScalar scale) {
@@ -22,12 +23,12 @@ SkXfermode* SkLerpXfermode::Create(SkScalar scale) {
 
 SkLerpXfermode::SkLerpXfermode(unsigned scale256) : fScale256(scale256) {}
 
-SkLerpXfermode::SkLerpXfermode(SkFlattenableReadBuffer& buffer)
+SkLerpXfermode::SkLerpXfermode(SkReadBuffer& buffer)
     : INHERITED(buffer) {
     fScale256 = buffer.readUInt();
 }
 
-void SkLerpXfermode::flatten(SkFlattenableWriteBuffer& buffer) const {
+void SkLerpXfermode::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeUInt(fScale256);
 }