Start using GrGpuCommandBuffer in GrDrawTarget.

src/gpu/batches/GrClearBatch.h

Index: src/gpu/batches/GrClearBatch.h
diff --git a/src/gpu/batches/GrClearBatch.h b/src/gpu/batches/GrClearBatch.h
index ba4b6d6daeabe94baa4ca052a3247026de9d0094..f2249cedb2f126c1dfc3df1f16cc4b3ec9201bb3 100644
--- a/src/gpu/batches/GrClearBatch.h
+++ b/src/gpu/batches/GrClearBatch.h
@@ -11,6 +11,7 @@
 #include "GrBatch.h"
 #include "GrBatchFlushState.h"
 #include "GrGpu.h"
+#include "GrGpuCommandBuffer.h"
 #include "GrRenderTarget.h"
 
 class GrClearBatch final : public GrBatch {
@@ -59,7 +60,7 @@ private:
     void onPrepare(GrBatchFlushState*) override {}
 
     void onDraw(GrBatchFlushState* state) override {
-        state->gpu()->clear(fRect, fColor, fRenderTarget.get());
+        state->commandBuffer()->clear(fRect, fColor, fRenderTarget.get());
     }
 
     SkIRect                                                 fRect;
@@ -100,7 +101,7 @@ private:
     void onPrepare(GrBatchFlushState*) override {}
 
     void onDraw(GrBatchFlushState* state) override {
-        state->gpu()->clearStencilClip(fRect, fInsideClip, fRenderTarget.get());
+        state->commandBuffer()->clearStencilClip(fRect, fInsideClip, fRenderTarget.get());
     }
 
     SkIRect                                                 fRect;