Add onNewLockPixels, that returns rowbytes and relies on info in pixelref

src/gpu/SkGrPixelRef.cpp

Index: src/gpu/SkGrPixelRef.cpp
diff --git a/src/gpu/SkGrPixelRef.cpp b/src/gpu/SkGrPixelRef.cpp
index a068d8dcc13f6fffb65aa58b608fabafa9fc4db6..8a16437780e3183b77cc0a6c849c2d119a256437 100644
--- a/src/gpu/SkGrPixelRef.cpp
+++ b/src/gpu/SkGrPixelRef.cpp
@@ -23,18 +23,22 @@ SkROLockPixelsPixelRef::SkROLockPixelsPixelRef(const SkImageInfo& info)
 
 SkROLockPixelsPixelRef::~SkROLockPixelsPixelRef() {}
 
-void* SkROLockPixelsPixelRef::onLockPixels(SkColorTable** ctable) {
-    if (ctable) {
-        *ctable = NULL;
-    }
+bool SkROLockPixelsPixelRef::onNewLockPixels(LockRec* rec) {
     fBitmap.reset();
 //    SkDebugf("---------- calling readpixels in support of lockpixels\n");
     if (!this->onReadPixels(&fBitmap, NULL)) {
         SkDebugf("SkROLockPixelsPixelRef::onLockPixels failed!\n");
-        return NULL;
+        return false;
     }
     fBitmap.lockPixels();
-    return fBitmap.getPixels();
+    if (NULL == fBitmap.getPixels()) {
+        return false;
+    }
+
+    rec->fPixels = fBitmap.getPixels();
+    rec->fColorTable = NULL;
+    rec->fRowBytes = fBitmap.rowBytes();
+    return true;
 }
 
 void SkROLockPixelsPixelRef::onUnlockPixels() {