Refactor read and write buffers.

Eliminates SkFlattenable{Read,Write}Buffer, promoting SkOrdered{Read,Write}Buffer
a step each in the hierarchy.

What used to be this:

SkFlattenableWriteBuffer -> SkOrderedWriteBuffer
SkFlattenableReadBuffer  -> SkOrderedReadBuffer
SkFlattenableReadBuffer  -> SkValidatingReadBuffer

is now

SkWriteBuffer
SkReadBuffer -> SkValidatingReadBuffer

Benefits:
  - code is simpler, names are less wordy
  - the generic SkFlattenableFooBuffer code in SkPaint was incorrect; removed
  - write buffers are completely devirtualized, important for record speed

This refactoring was mostly mechanical.  You aren't going to find anything
interesting in files with less than 10 lines changed.

BUG=skia:
R=reed@google.com, scroggo@google.com, djsollen@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/134163010

git-svn-id: http://skia.googlecode.com/svn/trunk@13245 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkEmbossMaskFilter.cpp b/src/effects/SkEmbossMaskFilter.cpp
index 5c95eeb..6747bf5 100644
--- a/src/effects/SkEmbossMaskFilter.cpp
+++ b/src/effects/SkEmbossMaskFilter.cpp
@@ -11,7 +11,8 @@
 #include "SkBlurMaskFilter.h"
 #include "SkBlurMask.h"
 #include "SkEmbossMask.h"
-#include "SkFlattenableBuffers.h"
+#include "SkReadBuffer.h"
+#include "SkWriteBuffer.h"
 #include "SkString.h"
 
 static inline int pin2byte(int n) {
@@ -129,7 +130,7 @@
     return true;
 }
 
-SkEmbossMaskFilter::SkEmbossMaskFilter(SkFlattenableReadBuffer& buffer)
+SkEmbossMaskFilter::SkEmbossMaskFilter(SkReadBuffer& buffer)
         : SkMaskFilter(buffer) {
     SkASSERT(buffer.getArrayCount() == sizeof(Light));
     buffer.readByteArray(&fLight, sizeof(Light));
@@ -137,7 +138,7 @@
     fBlurSigma = buffer.readScalar();
 }
 
-void SkEmbossMaskFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
+void SkEmbossMaskFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
 
     Light tmpLight = fLight;