Rename GrOptDrawState to GrPipeline and GrDrawState to GrPipelineBuilder

BUG=skia:

Review URL: https://codereview.chromium.org/858343002
diff --git a/src/gpu/GrSWMaskHelper.h b/src/gpu/GrSWMaskHelper.h
index 71dec63..c180971 100644
--- a/src/gpu/GrSWMaskHelper.h
+++ b/src/gpu/GrSWMaskHelper.h
@@ -9,7 +9,7 @@
 #define GrSWMaskHelper_DEFINED
 
 #include "GrColor.h"
-#include "GrDrawState.h"
+#include "GrPipelineBuilder.h"
 #include "SkBitmap.h"
 #include "SkDraw.h"
 #include "SkMatrix.h"
@@ -92,7 +92,7 @@
     // output of DrawPathMaskToTexture.
     static void DrawToTargetWithPathMask(GrTexture* texture,
                                          GrDrawTarget* target,
-                                         GrDrawState* drawState,
+                                         GrPipelineBuilder* pipelineBuilder,
                                          GrColor,
                                          const SkMatrix& viewMatrix,
                                          const SkIRect& rect);