Initial CL to move color / coverage off of drawstate

gm/yuvtorgbeffect.cpp

Index: gm/yuvtorgbeffect.cpp
diff --git a/gm/yuvtorgbeffect.cpp b/gm/yuvtorgbeffect.cpp
index 5e7a940e0be36773439b042568abf0091cf1b937..dbf9cd84c9a82c367eae814f7f987c17aa45e140 100644
--- a/gm/yuvtorgbeffect.cpp
+++ b/gm/yuvtorgbeffect.cpp
@@ -117,9 +117,8 @@ protected:
                     viewMatrix.setTranslate(x, y);
                     GrDrawState drawState(viewMatrix);
                     drawState.setRenderTarget(rt);
-                    drawState.setColor(0xffffffff);
                     drawState.addColorProcessor(fp);
-                    tt.target()->drawSimpleRect(&drawState, renderRect);
+                    tt.target()->drawSimpleRect(&drawState, GrColor_WHITE, renderRect);
                 }
                 x += renderRect.width() + kTestPad;
             }