Fixed a few places where uninitialized memory could have been read

src/effects/SkTileImageFilter.cpp

Index: src/effects/SkTileImageFilter.cpp
diff --git a/src/effects/SkTileImageFilter.cpp b/src/effects/SkTileImageFilter.cpp
index 7d3b72f0c6200bbd15f428b5bb22f866dc4baccb..dd4e72bd3c5ba92ed6a70230089ddf2234a6ef40 100644
--- a/src/effects/SkTileImageFilter.cpp
+++ b/src/effects/SkTileImageFilter.cpp
@@ -61,7 +61,7 @@ SkTileImageFilter::SkTileImageFilter(SkFlattenableReadBuffer& buffer)
   : INHERITED(1, buffer) {
     buffer.readRect(&fSrcRect);
     buffer.readRect(&fDstRect);
-    buffer.validate(SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
+    buffer.validate(buffer.validate(true) && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));

[sugoi1, 2013/12/05 18:45:47]

This extra validate(true) makes sure that we don't read uninitialized memory in
SkIsValidRect.

 }
 
 void SkTileImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {