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

src/opts/SkBitmapProcState_opts_arm.cpp

Index: src/opts/SkBitmapProcState_opts_arm.cpp
diff --git a/src/opts/SkBitmapProcState_opts_arm.cpp b/src/opts/SkBitmapProcState_opts_arm.cpp
index ffa0ccfa8aabe612d2dbc74f7892e3a6174c9c0b..8f24c39a2e178bfc301457a8e1fcc76e4c7c2c58 100644
--- a/src/opts/SkBitmapProcState_opts_arm.cpp
+++ b/src/opts/SkBitmapProcState_opts_arm.cpp
@@ -6,6 +6,7 @@
  */
 
 
+#include "SkBitmapScaler.h"
 #include "SkBitmapProcState.h"
 #include "SkColorPriv.h"
 #include "SkPaint.h"
@@ -229,6 +230,6 @@ 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);
 }