add/fix copyrights

src/opts/SkXfermode_opts_arm.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
 #include "SkXfermode.h"
 #include "SkXfermode_proccoeff.h"
 #include "SkUtilsArm.h"
 
 extern SkProcCoeffXfermode* SkPlatformXfermodeFactory_impl_neon(const ProcCoeff& rec,
                                                                 SkXfermode::Mode mode);
 
 extern SkXfermodeProc SkPlatformXfermodeProcFactory_impl_neon(SkXfermode::Mode mode);
 
 SkProcCoeffXfermode* SkPlatformXfermodeFactory_impl(const ProcCoeff& rec,
                                                     SkXfermode::Mode mode) {
     return NULL;
 }
 
 SkXfermodeProc SkPlatformXfermodeProcFactory_impl(SkXfermode::Mode mode) {
     return NULL;
 }
 
 SkProcCoeffXfermode* SkPlatformXfermodeFactory(const ProcCoeff& rec,
                                                SkXfermode::Mode mode) {
     return SK_ARM_NEON_WRAP(SkPlatformXfermodeFactory_impl)(rec, mode);
 }
 
 SkXfermodeProc SkPlatformXfermodeProcFactory(SkXfermode::Mode mode) {
     return SK_ARM_NEON_WRAP(SkPlatformXfermodeProcFactory_impl)(mode);
 }