add/fix copyrights

src/opts/SkBlitRow_opts_SSE4.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 "SkBlitRow_opts_SSE4.h"
 
 // Some compilers can't compile SSSE3 or SSE4 intrinsics.  We give them stub methods.
 // The stubs should never be called, so we make them crash just to confirm that.
 #if SK_CPU_SSE_LEVEL < SK_CPU_SSE_LEVEL_SSE41
 void S32A_Opaque_BlitRow32_SSE4(SkPMColor* SK_RESTRICT, const SkPMColor* SK_RESTRICT, int, U8CPU) {
     sk_throw();
 }
 
 #else
@@ skipping 44 matching lines @@
     // Wrap up the last <= 15 pixels.
     for (int i = count16*16; i < count; i++) {
         // This check is not really necessarily, but it prevents pointless autovectorization.
         if (src[i] & 0xFF000000) {
             dst[i] = SkPMSrcOver(src[i], dst[i]);
         }
     }
 }
 
 #endif