Rename GrOptDrawState to GrPipeline and GrDrawState to GrPipelineBuilder

BUG=skia:

Review URL: https://codereview.chromium.org/858343002
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index 5ec4dcf..ef2517d 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -48,7 +48,7 @@
 #include "GrInOrderDrawBuffer.h"
 #include "GrGpu.h"
 
-class GrOptDrawState;
+class GrPipeline;
 
 class MockGpu : public GrGpu {
 public:
@@ -64,7 +64,7 @@
                                    GrPixelConfig config,
                                    size_t rowBytes) const SK_OVERRIDE { return false; }
     void buildProgramDesc(GrProgramDesc*,const GrPrimitiveProcessor&,
-                          const GrOptDrawState&,
+                          const GrPipeline&,
                           const GrProgramDesc::DescInfo&,
                           const GrBatchTracker&) const SK_OVERRIDE {}