Add query for block dimensions of a given format

src/opts/SkTextureCompression_opts_none.cpp

Index: src/opts/SkTextureCompression_opts_none.cpp
diff --git a/src/opts/SkTextureCompression_opts_none.cpp b/src/opts/SkTextureCompression_opts_none.cpp
index f86fbf5f297a570a88065cf5b246b48125212a19..caa211859a36b372e273a98ff8dfb5b51de9d705 100644
--- a/src/opts/SkTextureCompression_opts_none.cpp
+++ b/src/opts/SkTextureCompression_opts_none.cpp
@@ -11,3 +11,7 @@ SkTextureCompressor::CompressionProc
 SkTextureCompressorGetPlatformProc(SkColorType colorType, SkTextureCompressor::Format fmt) {
     return NULL;
 }
+
+bool SkTextureCompressorGetPlatformDims(SkTextureCompressor::Format fmt, int* dimX, int* dimY) {
+    return false;
+}