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/core/SkAnnotation.cpp b/src/core/SkAnnotation.cpp
index 837cb62..6ba645f 100644
--- a/src/core/SkAnnotation.cpp
+++ b/src/core/SkAnnotation.cpp
@@ -7,7 +7,8 @@
 
 #include "SkAnnotation.h"
 #include "SkData.h"
-#include "SkFlattenableBuffers.h"
+#include "SkReadBuffer.h"
+#include "SkWriteBuffer.h"
 #include "SkPoint.h"
 #include "SkStream.h"
 
@@ -28,12 +29,12 @@
     return fKey.equals(key) ? fData : NULL;
 }
 
-SkAnnotation::SkAnnotation(SkFlattenableReadBuffer& buffer) {
+SkAnnotation::SkAnnotation(SkReadBuffer& buffer) {
     buffer.readString(&fKey);
     fData = buffer.readByteArrayAsData();
 }
 
-void SkAnnotation::writeToBuffer(SkFlattenableWriteBuffer& buffer) const {
+void SkAnnotation::writeToBuffer(SkWriteBuffer& buffer) const {
     buffer.writeString(fKey.c_str());
     buffer.writeDataAsByteArray(fData);
 }