Add whitelist parameter to refEncodedData

src/core/SkImageCacherator.cpp

Index: src/core/SkImageCacherator.cpp
diff --git a/src/core/SkImageCacherator.cpp b/src/core/SkImageCacherator.cpp
index 7b5ff2267774463584c525bdd0f2cc5ee3fcbd8a..8d6a65a39733182be113479e7a1d3b30e05374e4 100644
--- a/src/core/SkImageCacherator.cpp
+++ b/src/core/SkImageCacherator.cpp
@@ -25,6 +25,16 @@
 #include "SkGrPriv.h"
 #endif
 
+bool SkGpuFormatWhitelist::includes(SkEncodedFormat format) {
+#if SK_SUPPORT_GPU
+    return GrIsCompressedFormatPossiblySupported(fCtx, format);
+#else
+    return false;
+#endif
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
 SkImageCacherator* SkImageCacherator::NewFromGenerator(SkImageGenerator* gen,
                                                        const SkIRect* subset) {
     if (!gen) {
@@ -70,8 +80,15 @@ SkImageCacherator::SkImageCacherator(SkImageGenerator* gen, const SkImageInfo& i
 {}
 
 SkData* SkImageCacherator::refEncoded(GrContext* ctx) {
+    SkImageGenerator::RefEncodedWhitelist* whitelist = nullptr;
+#if SK_SUPPORT_GPU
+    SkGpuFormatWhitelist gpuWhitelist(ctx);
+    if (ctx) {
+        whitelist = &gpuWhitelist;
+    }
+#endif
     ScopedGenerator generator(this);
-    return generator->refEncodedData(ctx);
+    return generator->refEncodedData(whitelist);
 }
 
 static bool check_output_bitmap(const SkBitmap& bitmap, uint32_t expectedID) {