Restrict query bounds for reduce clip to dev bounds

src/gpu/batches/GrBatch.h

Index: src/gpu/batches/GrBatch.h
diff --git a/src/gpu/batches/GrBatch.h b/src/gpu/batches/GrBatch.h
index c5fc80c5d50dfbd622dfb69e3eb9adfbcd3c31f9..5191603cf946997c8ca5ffde8f2d902ce8ca44d2 100644
--- a/src/gpu/batches/GrBatch.h
+++ b/src/gpu/batches/GrBatch.h
@@ -31,6 +31,10 @@ class GrBatchFlushState;
  * If there are any possible optimizations which might require knowing more about the full state of
  * the draw, ie whether or not the GrBatch is allowed to tweak alpha for coverage, then this
  * information will be communicated to the GrBatch prior to geometry generation.
+ *
+ * The bounds of the batch must contain all the pixels that would be modified *irrespective* of the
+ * clip. The bounds are used in determining which clip elements must be applied and thus the bounds
+ * cannot in turn depend upon the clip.
  */
 #define GR_BATCH_SPEW 0
 #if GR_BATCH_SPEW