Refactor bitmap scaler to make it easier to migrate rest of chrome to use it

src/opts/SkBitmapProcState_opts_none.cpp

Index: src/opts/SkBitmapProcState_opts_none.cpp
diff --git a/src/opts/SkBitmapProcState_opts_none.cpp b/src/opts/SkBitmapProcState_opts_none.cpp
index 96e711b47240a2406ee280a56a31fdd921914508..88aaa93e21a005b9a1af8c7abc68465cf9109111 100644
--- a/src/opts/SkBitmapProcState_opts_none.cpp
+++ b/src/opts/SkBitmapProcState_opts_none.cpp
@@ -5,6 +5,8 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
+#include "SkBitmapScaler.h"
 #include "SkBitmapProcState.h"
 
 /*  A platform may optionally overwrite any of these with accelerated
@@ -23,4 +25,4 @@
 void SkBitmapProcState::platformProcs() {}
 
 // empty implementation just uses default supplied function pointers
-void SkBitmapProcState::platformConvolutionProcs(SkConvolutionProcs*) {}
+void SkBitmapScaler::PlatformConvolutionProcs(SkConvolutionProcs*) {}