Use perfect forwarding in createT of SkSmallAllocator.

This allows createT statements to be written in a clearer style.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2482683002

Review-Url: https://codereview.chromium.org/2482683002

src/core/SkSmallAllocator.h

@@ -12,6 +12,7 @@
 #include "SkTypes.h"
 
 #include <new>
+#include <utility>
 
 /*
  *  Template class for allocating small objects without additional heap memory
@@ -56,12 +57,12 @@ public:
      *  will be returned.
      */
     template<typename T, typename... Args>
-    T* createT(const Args&... args) {
+    T* createT(Args&&... args) {
         void* buf = this->reserveT<T>();
         if (nullptr == buf) {
             return nullptr;
         }
-        return new (buf) T(args...);
+        return new (buf) T(std::forward<Args>(args)...);
     }
 
     /*
@@ -130,8 +131,7 @@ private:
     }
 
     alignas(16) char fStorage[kTotalBytes];
-    // Number of bytes used so far.
-    size_t   fStorageUsed;
+    size_t           fStorageUsed;  // Number of bytes used so far.
     uint32_t         fNumObjects;
     Rec              fRecs[kMaxObjects];
 };

src/utils/SkTextureCompressor_ASTC.cpp

@@ -2073,8 +2073,7 @@ SkBlitter* CreateASTCBlitter(int width, int height, void* outputBuffer,
     }
 
     return allocator->createT<
-        SkTCompressedAlphaBlitter<12, 16, CompressorASTC>, int, int, void* >
-        (width, height, outputBuffer);
+        SkTCompressedAlphaBlitter<12, 16, CompressorASTC>>(width, height, outputBuffer);
 }
 
 void DecompressASTC(uint8_t* dst, int dstRowBytes, const uint8_t* src,

src/utils/SkTextureCompressor_LATC.cpp

@@ -498,8 +498,7 @@ SkBlitter* CreateLATCBlitter(int width, int height, void* outputBuffer,
     sk_bzero(outputBuffer, width * height / 2);
 
     return allocator->createT<
-        SkTCompressedAlphaBlitter<4, 8, CompressorLATC>, int, int, void* >
-        (width, height, outputBuffer);
+        SkTCompressedAlphaBlitter<4, 8, CompressorLATC>>(width, height, outputBuffer);
 #elif COMPRESS_LATC_SLOW
     // TODO (krajcevski)
     return nullptr;

src/utils/SkTextureCompressor_R11EAC.cpp

@@ -653,8 +653,7 @@ SkBlitter* CreateR11EACBlitter(int width, int height, void* outputBuffer,
     }
 
     return allocator->createT<
-        SkTCompressedAlphaBlitter<4, 8, CompressorR11EAC>, int, int, void*>
-        (width, height, outputBuffer);
+        SkTCompressedAlphaBlitter<4, 8, CompressorR11EAC>>(width, height, outputBuffer);
 }
 
 void DecompressR11EAC(uint8_t* dst, int dstRowBytes, const uint8_t* src, int width, int height) {