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/samplecode/ClockFaceView.cpp b/samplecode/ClockFaceView.cpp
index 32c8161..ed0bce9 100644
--- a/samplecode/ClockFaceView.cpp
+++ b/samplecode/ClockFaceView.cpp
@@ -8,7 +8,8 @@
 #include "SampleCode.h"
 #include "SkView.h"
 #include "SkCanvas.h"
-#include "SkFlattenableBuffers.h"
+#include "SkReadBuffer.h"
+#include "SkWriteBuffer.h"
 #include "SkGradientShader.h"
 #include "SkPath.h"
 #include "SkRegion.h"
@@ -89,12 +90,12 @@
         dst->addCircle(loc.fX, loc.fY, fRadius);
     }
 
-    Dot2DPathEffect(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
+    Dot2DPathEffect(SkReadBuffer& buffer) : INHERITED(buffer) {
         fRadius = buffer.readScalar();
         fPts = NULL;
     }
 
-    virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE {
+    virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
         this->INHERITED::flatten(buffer);
         buffer.writeScalar(fRadius);
     }
@@ -118,7 +119,7 @@
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(InverseFillPE)
 
 protected:
-    InverseFillPE(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
+    InverseFillPE(SkReadBuffer& buffer) : INHERITED(buffer) {}
 private:
 
     typedef SkPathEffect INHERITED;