Use sse4.2 CRC32 instructions to hash when available.

tools/UrlDataManager.h

Index: tools/UrlDataManager.h
diff --git a/tools/UrlDataManager.h b/tools/UrlDataManager.h
index 49646ca607272b6ed4e80f786f4d65d6fe16678e..bae1dc7047c73c487b927b264d84d394a503e089 100644
--- a/tools/UrlDataManager.h
+++ b/tools/UrlDataManager.h
@@ -8,8 +8,8 @@
 #ifndef SkUrlDataManager_DEFINED
 #define SkUrlDataManager_DEFINED
 
-#include "SkChecksum.h"
 #include "SkData.h"
+#include "SkOpts.h"
 #include "SkString.h"
 #include "SkTDynamicHash.h"
 
@@ -52,7 +52,7 @@ private:
         }
 
         static uint32_t Hash(const SkData& key) {
-            return SkChecksum::Murmur3(key.bytes(), key.size());
+            return SkOpts::hash(key.bytes(), key.size());
         }
     };
 
@@ -62,7 +62,7 @@ private:
         }
 
         static uint32_t Hash(const SkString& key) {
-            return SkChecksum::Murmur3(key.c_str(), strlen(key.c_str()));
+            return SkOpts::hash(key.c_str(), strlen(key.c_str()));
         }
     };