new API for retrieving YUV data

src/lazy/SkDiscardablePixelRef.h

Index: src/lazy/SkDiscardablePixelRef.h
diff --git a/src/lazy/SkDiscardablePixelRef.h b/src/lazy/SkDiscardablePixelRef.h
index 448f0ab24b907c1fe7b3ce1e49146905e30f0cd3..17447f81484a93b5a120a1ebe81ace19d57c1f61 100644
--- a/src/lazy/SkDiscardablePixelRef.h
+++ b/src/lazy/SkDiscardablePixelRef.h
@@ -48,11 +48,13 @@ private:
                           size_t rowBytes,
                           SkDiscardableMemory::Factory* factory);
 
-    virtual bool onGetYUV8Planes(SkISize sizes[3],
-                                 void* planes[3],
-                                 size_t rowBytes[3],
-                                 SkYUVColorSpace* colorSpace) SK_OVERRIDE {
-        return fGenerator->getYUV8Planes(sizes, planes, rowBytes, colorSpace);
+    bool onQueryYUV8(SkISize logical[3], SkISize optimal[3]) SK_OVERRIDE {
+        return fGenerator->queryYUV8(logical, optimal);
+    }
+
+    bool onGetYUV8(const SkISize allocationSizes[3], void* planes[3],
+                   SkYUVColorSpace* cspace) SK_OVERRIDE {
+        return fGenerator->getYUV8(allocationSizes, planes, cspace);
     }
 
     friend bool SkInstallDiscardablePixelRef(SkImageGenerator*, SkBitmap*,