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

src/opts/SkBitmapProcState_opts_arm.cpp

 /*
  * Copyright 2009 The Android Open Source Project
  *
  * 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"
 #include "SkColorPriv.h"
 #include "SkPaint.h"
 #include "SkTypes.h"
 #include "SkUtils.h"
 #include "SkUtilsArm.h"
 
 #include "SkConvolver.h"
 
 #if !defined(SK_CPU_ARM64) && SK_ARM_ARCH >= 6 && !defined(SK_CPU_BENDIAN)
@@ skipping 203 matching lines @@
 #endif
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 extern void platformConvolutionProcs_arm_neon(SkConvolutionProcs* procs);
 
 void platformConvolutionProcs_arm(SkConvolutionProcs* procs) {
 }
 
-void SkBitmapProcState::platformConvolutionProcs(SkConvolutionProcs* procs) {
+void SkBitmapScaler::PlatformConvolutionProcs(SkConvolutionProcs* procs) {
     SK_ARM_NEON_WRAP(platformConvolutionProcs_arm)(procs);
 }