separate state for msaa renderability

R=robertphillips@google.com, brian@thesalomons.net

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/26695005

git-svn-id: http://skia.googlecode.com/svn/trunk/include@11770 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/GrContext.h b/gpu/GrContext.h
index 973185c..7716f9a 100644
--- a/gpu/GrContext.h
+++ b/gpu/GrContext.h
@@ -286,7 +286,7 @@
     /**
      * Can the provided configuration act as a color render target?
      */
-    bool isConfigRenderable(GrPixelConfig config) const;
+    bool isConfigRenderable(GrPixelConfig config, bool withMSAA) const;
 
     /**
      * Return the max width or height of a render target supported by the