Make Skia build as a dynamic library by fixing up the imports.

skia/ports/SkImageDecoder_Factory.cpp

Index: skia/ports/SkImageDecoder_Factory.cpp
diff --git a/skia/ports/SkImageDecoder_Factory.cpp b/skia/ports/SkImageDecoder_Factory.cpp
index d5d7b3fbc62ac425452b53ccfd8650c87e70be40..585957c8f326072dc77be8383722e1cf4ed7e976 100644
--- a/skia/ports/SkImageDecoder_Factory.cpp
+++ b/skia/ports/SkImageDecoder_Factory.cpp
@@ -34,12 +34,14 @@ struct CodecFormat {
 };
 
 static const CodecFormat gPairs[] = {
+#ifdef SK_SUPPORT_IMAGE_DECODE
     { SkImageDecoder_GIF_Factory,   SkImageDecoder::kGIF_Format },
     { SkImageDecoder_PNG_Factory,   SkImageDecoder::kPNG_Format },
     { SkImageDecoder_ICO_Factory,   SkImageDecoder::kICO_Format },
     { SkImageDecoder_WBMP_Factory,  SkImageDecoder::kWBMP_Format },
     { SkImageDecoder_BMP_Factory,   SkImageDecoder::kBMP_Format },
     { SkImageDecoder_JPEG_Factory,  SkImageDecoder::kJPEG_Format }
+#endif
 };
 
 SkImageDecoder* SkImageDecoder::Factory(SkStream* stream) {
@@ -73,11 +75,15 @@ extern SkMovie* SkMovie_GIF_StreamFactory(SkStream*);
 extern SkMovie* SkMovie_GIF_MemoryFactory(const void*, size_t);
 
 static const SkMovieStreamProc gStreamProc[] = {
+#ifdef SK_SUPPORT_IMAGE_DECODE
     SkMovie_GIF_StreamFactory
+#endif
 };
 
 static const SkMovieMemoryProc gMemoryProc[] = {
+#ifdef SK_SUPPORT_IMAGE_DECODE
     SkMovie_GIF_MemoryFactory
+#endif
 };
 
 SkMovie* SkMovie::DecodeStream(SkStream* stream) {