More win64 warning fixes

src/gpu/GrProgramDesc.h

 /*
  * 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 GrProgramDesc_DEFINED
 #define GrProgramDesc_DEFINED
 
@@ skipping 18 matching lines @@
     // Gets the number of bytes in asKey(). It will be a 4-byte aligned value. When comparing two
     // keys the size of either key can be used with memcmp() since the lengths themselves begin the
     // keys and thus the memcmp will exit early if the keys are of different lengths.
     uint32_t keyLength() const { return *this->atOffset<uint32_t, kLengthOffset>(); }
 
     // Gets the a checksum of the key. Can be used as a hash value for a fast lookup in a cache.
     uint32_t getChecksum() const { return *this->atOffset<uint32_t, kChecksumOffset>(); }
 
     GrProgramDesc& operator= (const GrProgramDesc& other) {
         uint32_t keyLength = other.keyLength();
-        fKey.reset(keyLength);
+        fKey.reset(SkToInt(keyLength));
         memcpy(fKey.begin(), other.fKey.begin(), keyLength);
         return *this;
     }
 
     bool operator== (const GrProgramDesc& other) const {
         // The length is masked as a hint to the compiler that the address will be 4 byte aligned.
         return 0 == memcmp(this->asKey(), other.asKey(), this->keyLength() & ~0x3);
     }
 
     bool operator!= (const GrProgramDesc& other) const {
@@ skipping 157 matching lines @@
         kPreAllocSize = kHeaderOffset + kHeaderSize +
                         kMaxPreallocProcessors * sizeof(uint32_t) * kIntsPerProcessor,
     };
 
     SkSTArray<kPreAllocSize, uint8_t, true> fKey;
 
     friend class GrGLProgramDescBuilder;
 };
 
 #endif