Add whitelist parameter to refEncodedData

src/gpu/SkGr.cpp

Index: src/gpu/SkGr.cpp
diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp
index 716909133a733d28bb03efafe13d214384e47d98..4f7af1566c7670cb5373f7f76d9f19af43ef0de0 100644
--- a/src/gpu/SkGr.cpp
+++ b/src/gpu/SkGr.cpp
@@ -22,6 +22,7 @@
 #include "SkConfig8888.h"
 #include "SkCanvas.h"
 #include "SkData.h"
+#include "SkEncodedFormat.h"
 #include "SkErrorInternals.h"
 #include "SkGrPixelRef.h"
 #include "SkMessageBus.h"
@@ -66,6 +67,21 @@ void GrMakeKeyFromImageID(GrUniqueKey* key, uint32_t imageID, const SkIRect& ima
     builder[4] = imageBounds.fBottom;
 }
 
+bool GrIsCompressedFormatPossiblySupported(GrContext* ctx, SkEncodedFormat format) {
+#ifndef SK_IGNORE_ETC1_SUPPORT
+    if (!ctx->caps()->isConfigTexturable(kETC1_GrPixelConfig)) {
+        return false;
+    }
+    switch (format) {
+        case kPKM_SkEncodedFormat:  // file format for ETC1
+            return true;
+        default:
+            return false;
+    }
+#endif
+    return false;
+}
+
 GrPixelConfig GrIsCompressedTextureDataSupported(GrContext* ctx, SkData* data,
                                                  int expectedW, int expectedH,
                                                  const void** outStartOfDataToUpload) {