Slim Skia down to just one murmur3 implementation.

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index 64603b4cb5244b423ccdf32c28c7b7bd7519a617..8a0e734b245fd7562c4d6135d8cce9e8a308be3c 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -8,6 +8,7 @@
 #include "SkImageFilter.h"
 
 #include "SkBitmap.h"
+#include "SkChecksum.h"
 #include "SkDevice.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ -334,31 +335,6 @@ bool SkImageFilter::getInputResultGPU(SkImageFilter::Proxy* proxy,
 }
 #endif
 
-static uint32_t compute_hash(const uint32_t* data, int count) {
-    uint32_t hash = 0;
-
-    for (int i = 0; i < count; ++i) {
-        uint32_t k = data[i];
-        k *= 0xcc9e2d51;
-        k = (k << 15) | (k >> 17);
-        k *= 0x1b873593;
-
-        hash ^= k;
-        hash = (hash << 13) | (hash >> 19);
-        hash *= 5;
-        hash += 0xe6546b64;
-    }
-
-    //    hash ^= size;
-    hash ^= hash >> 16;
-    hash *= 0x85ebca6b;
-    hash ^= hash >> 13;
-    hash *= 0xc2b2ae35;
-    hash ^= hash >> 16;
-
-    return hash;
-}
-
 class CacheImpl : public SkImageFilter::Cache {
 public:
     explicit CacheImpl(int minChildren) : fMinChildren(minChildren) {
@@ -381,7 +357,7 @@ private:
             return v.fKey;
         }
         static uint32_t Hash(Key key) {
-            return compute_hash(reinterpret_cast<const uint32_t*>(&key), sizeof(Key) / sizeof(uint32_t));
+            return SkChecksum::Murmur3(reinterpret_cast<const uint32_t*>(&key), sizeof(Key));
         }
     };
     SkTDynamicHash<Value, Key> fData;