rolling tree back to its state as of r2169 to see if that fixes Windows buildbots

git-svn-id: http://skia.googlecode.com/svn/trunk@2179 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrClip.cpp b/gpu/src/GrClip.cpp
index ade8c2b..7ccec26 100644
--- a/gpu/src/GrClip.cpp
+++ b/gpu/src/GrClip.cpp
@@ -138,9 +138,13 @@
         }
     }
     fConservativeBoundsValid = false;
-    if (isectRectValid && rectCount) {
-        fConservativeBounds = fList[0].fRect;
+    if (isectRectValid) {
         fConservativeBoundsValid = true;
+        if (rectCount > 0) {
+            fConservativeBounds = fList[0].fRect;
+        } else {
+            fConservativeBounds.setEmpty();
+        }
     } else if (NULL != conservativeBounds) {
         fConservativeBounds = *conservativeBounds;
         fConservativeBoundsValid = true;