Rewrite SkTRegistry to take any trivially-copyable type.

src/images/SkImageDecoder_libbmp.cpp

Index: src/images/SkImageDecoder_libbmp.cpp
diff --git a/src/images/SkImageDecoder_libbmp.cpp b/src/images/SkImageDecoder_libbmp.cpp
index 73e7a2014459417e713673e5ab64a55726153bbf..4757f250dad8cddc4e84f6aa9ebee05289723b08 100644
--- a/src/images/SkImageDecoder_libbmp.cpp
+++ b/src/images/SkImageDecoder_libbmp.cpp
@@ -52,7 +52,7 @@ static SkImageDecoder* sk_libbmp_dfactory(SkStream* stream) {
     return NULL;
 }
 
-static SkTRegistry<SkImageDecoder*, SkStream*> gReg(sk_libbmp_dfactory);
+static SkTRegistry<SkImageDecoder*(*)(SkStream*)> gReg(sk_libbmp_dfactory);
 
 static SkImageDecoder::Format get_format_bmp(SkStream* stream) {
     if (is_bmp(stream)) {
@@ -61,7 +61,7 @@ static SkImageDecoder::Format get_format_bmp(SkStream* stream) {
     return SkImageDecoder::kUnknown_Format;
 }
 
-static SkTRegistry<SkImageDecoder::Format, SkStream*> gFormatReg(get_format_bmp);
+static SkTRegistry<SkImageDecoder::Format(*)(SkStream*)> gFormatReg(get_format_bmp);
 
 ///////////////////////////////////////////////////////////////////////////////