Expand pixelref to return SkImageInfo and rowbytes

src/gpu/SkGrPixelRef.cpp

Index: src/gpu/SkGrPixelRef.cpp
diff --git a/src/gpu/SkGrPixelRef.cpp b/src/gpu/SkGrPixelRef.cpp
index dc5d7558f0d7a3e5c0294ec59f08f1622ef0ea16..d5d957f5cadb1c78db0225c071a5eccfc2e43c1a 100644
--- a/src/gpu/SkGrPixelRef.cpp
+++ b/src/gpu/SkGrPixelRef.cpp
@@ -24,10 +24,8 @@ SkROLockPixelsPixelRef::SkROLockPixelsPixelRef() : INHERITED(&gROLockPixelsPixel
 SkROLockPixelsPixelRef::~SkROLockPixelsPixelRef() {
 }
 
-void* SkROLockPixelsPixelRef::onLockPixels(SkColorTable** ctable) {
-    if (ctable) {
-        *ctable = NULL;
-    }
+void* SkROLockPixelsPixelRef::onLockPixels(SkImageInfo* info, size_t* rowBytes,
+                                           SkColorTable** ctable) {
     fBitmap.reset();
 //    SkDebugf("---------- calling readpixels in support of lockpixels\n");
     if (!this->onReadPixels(&fBitmap, NULL)) {
@@ -35,6 +33,10 @@ void* SkROLockPixelsPixelRef::onLockPixels(SkColorTable** ctable) {
         return NULL;
     }
     fBitmap.lockPixels();
+
+    fBitmap.asImageInfo(info);
+    *rowBytes = fBitmap.rowBytes();
+    *ctable = NULL;
     return fBitmap.getPixels();
 }