Retract GrRenderTarget a bit

include/gpu/GrDrawContext.h

Index: include/gpu/GrDrawContext.h
diff --git a/include/gpu/GrDrawContext.h b/include/gpu/GrDrawContext.h
index e0a9b0eedb4b2cdcf24f81272e272ff3a444dfa7..82cf362d5799ecef0899f1b2ba97261cde97ce76 100644
--- a/include/gpu/GrDrawContext.h
+++ b/include/gpu/GrDrawContext.h
@@ -9,6 +9,7 @@
 #define GrDrawContext_DEFINED
 
 #include "GrColor.h"
+#include "GrRenderTarget.h"
 #include "SkRefCnt.h"
 #include "SkSurfaceProps.h"
 
@@ -273,6 +274,10 @@ public:
      */
     void drawBatch(const GrClip&, const GrPaint&, GrDrawBatch*);
 
+    int width() const { return fRenderTarget->width(); }
+    int height() const { return fRenderTarget->height(); }
+    int numColorSamples() const { return fRenderTarget->numColorSamples(); }
+
 private:
     friend class GrAtlasTextContext; // for access to drawBatch
     friend class GrDrawingManager; // for ctor