Make textures register with GrResourceCache2 as scratch.

src/gpu/GrMurmur3HashKey.h

Index: src/gpu/GrMurmur3HashKey.h
diff --git a/src/gpu/GrMurmur3HashKey.h b/src/gpu/GrMurmur3HashKey.h
new file mode 100644
index 0000000000000000000000000000000000000000..ad1fa7c96dda564ffb8cce56aca8ebc4282ddd09
--- /dev/null
+++ b/src/gpu/GrMurmur3HashKey.h
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+
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef GrMurmur3HashKey_DEFINED
+#define GrMurmur3HashKey_DEFINED
+
+#include "SkChecksum.h"
+#include "GrTypes.h"
+
+/**
+ *  GrMurmur3HashKey is a hash key class that can take a data chunk of any predetermined
+ *  length. It uses the Murmur3 hash function. It is intended to be used with
+ *  SkTDynamicHash (where GrBinHashKey is for GrTHashTable).
+ */
+template<size_t KEY_SIZE_IN_BYTES>
+class GrMurmur3HashKey {
+public:
+    GrMurmur3HashKey() {
+        this->reset();
+    }
+
+    void reset() {
+        fHash = 0;
+#ifdef SK_DEBUG
+        fIsValid = false;
+#endif
+    }
+
+    void setKeyData(const uint32_t* data) {
+        SK_COMPILE_ASSERT(KEY_SIZE_IN_BYTES % 4 == 0, key_size_mismatch);
+        memcpy(fData, data, KEY_SIZE_IN_BYTES);
+
+        fHash = SkChecksum::Murmur3(fData, KEY_SIZE_IN_BYTES);
+#ifdef SK_DEBUG
+        fIsValid = true;
+#endif
+    }
+
+    bool operator==(const GrMurmur3HashKey& other) const {
+        if (fHash != other.fHash) {
+            return false;
+        }
+
+        return !memcmp(fData, other.fData, KEY_SIZE_IN_BYTES);
+    }
+
+    uint32_t getHash() const {
+        SkASSERT(fIsValid);
+        return fHash;
+    }
+
+    const uint8_t* getData() const {
+        SkASSERT(fIsValid);
+        return reinterpret_cast<const uint8_t*>(fData);
+    }
+
+private:
+    uint32_t fHash;
+    uint32_t fData[KEY_SIZE_IN_BYTES / sizeof(uint32_t)];  // Buffer for key storage.
+
+#ifdef SK_DEBUG
+public:
+    bool                fIsValid;
+#endif
+};
+
+#endif