Add isUnblended query to GrDrawState.

src/gpu/GrDrawState.h

Index: src/gpu/GrDrawState.h
diff --git a/src/gpu/GrDrawState.h b/src/gpu/GrDrawState.h
index 15df975d73c4470d5c1e0b83a85ae77c96e4fe9a..118162970756dd0d8aa3ef844e30a6daca5473ee 100644
--- a/src/gpu/GrDrawState.h
+++ b/src/gpu/GrDrawState.h
@@ -159,6 +159,12 @@ public:
      */
     bool hasSolidCoverage() const;
 
+    /**
+     * This function returns false if the render target destination pixel values will not be read

[bsalomon, 2014/11/11 21:08:38]

"true if the destination pixel values will be read" to avoid double negative?

+     * for blending during draw.
+     */
+    bool willBlendWithDst() const;
+
     /// @}
 
     ///////////////////////////////////////////////////////////////////////////