Add flag for window rectangles to GrRenderTarget

include/gpu/GrTypes.h

Index: include/gpu/GrTypes.h
diff --git a/include/gpu/GrTypes.h b/include/gpu/GrTypes.h
index a0f13aa6febcbf35f8909ac486e44d3eef5f5f5b..8a1d7a6c07d470fa4fa280fee017109c57b3e4c0 100644
--- a/include/gpu/GrTypes.h
+++ b/include/gpu/GrTypes.h
@@ -49,6 +49,27 @@
     \
     template <typename T> \
     friend X operator & (X a, T b); \
+
+/**
+ * Defines bitwise operators that make it possible to use an enum class as a
+ * very basic bitfield.
+ */
+#define GR_MAKE_BITFIELD_CLASS_OPS(X) \
+    inline X operator | (X a, X b) { \
+        return (X) ((int)a | (int)b); \
+    } \
+    inline X& operator |= (X& a, X b) { \
+        return (a = a | b); \
+    } \
+    inline bool operator & (X a, X b) { \
+        return ((int)a & (int)b); \
+    }
+
+#define GR_DECL_BITFIELD_CLASS_OPS_FRIENDS(X) \
+    friend X operator | (X a, X b); \
+    friend X& operator |= (X& a, X b); \
+    friend bool operator & (X a, X b);
+
 ////////////////////////////////////////////////////////////////////////////////
 
 // compile time versions of min/max