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/SkDashPathEffect.cpp b/src/effects/SkDashPathEffect.cpp
index 52875bc..8be5f1d 100644
--- a/src/effects/SkDashPathEffect.cpp
+++ b/src/effects/SkDashPathEffect.cpp
@@ -8,7 +8,8 @@
 
 
 #include "SkDashPathEffect.h"
-#include "SkFlattenableBuffers.h"
+#include "SkReadBuffer.h"
+#include "SkWriteBuffer.h"
 #include "SkPathMeasure.h"
 
 static inline int is_even(int x) {
@@ -532,7 +533,7 @@
     return fInitialDashLength < 0 ? NULL : CreateProc;
 }
 
-void SkDashPathEffect::flatten(SkFlattenableWriteBuffer& buffer) const {
+void SkDashPathEffect::flatten(SkWriteBuffer& buffer) const {
     SkASSERT(fInitialDashLength >= 0);
 
     this->INHERITED::flatten(buffer);
@@ -543,11 +544,11 @@
     buffer.writeScalarArray(fIntervals, fCount);
 }
 
-SkFlattenable* SkDashPathEffect::CreateProc(SkFlattenableReadBuffer& buffer) {
+SkFlattenable* SkDashPathEffect::CreateProc(SkReadBuffer& buffer) {
     return SkNEW_ARGS(SkDashPathEffect, (buffer));
 }
 
-SkDashPathEffect::SkDashPathEffect(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
+SkDashPathEffect::SkDashPathEffect(SkReadBuffer& buffer) : INHERITED(buffer) {
     fInitialDashIndex = buffer.readInt();
     fInitialDashLength = buffer.readScalar();
     fIntervalLength = buffer.readScalar();