Start using GrGpuCommandBuffer in GrDrawTarget.

src/gpu/GrGpuCommandBuffer.cpp

Index: src/gpu/GrGpuCommandBuffer.cpp
diff --git a/src/gpu/GrGpuCommandBuffer.cpp b/src/gpu/GrGpuCommandBuffer.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4e81bc7337f48cf26e2e92c6fe14cf3ed74b3b78
--- /dev/null
+++ b/src/gpu/GrGpuCommandBuffer.cpp
@@ -0,0 +1,30 @@
+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#include "GrGpuCommandBuffer.h"
+
+#include "GrGpu.h"
+#include "GrPrimitiveProcessor.h"
+
+
+void GrGpuCommandBuffer::submit(const SkIRect& bounds) {
+    this->gpu()->handleDirtyContext();

[jvanverth1, 2016/06/17 15:25:15]

It'd be less verbose to just say fGpu->

[egdaniel, 2016/06/17 15:57:35]

The base class doesn't have a fGpu. I could pass the gpu up from the sub class,
but then when I want to call a backend specific function in the subclasses I
need to cast the gpu to the backend version. Alternatively I could store
pointers the gpu object both here and the subclass.

[jvanverth1, 2016/06/17 16:49:13]

It's fine the way it is.

+    this->onSubmit(bounds);
+}
+
+bool GrGpuCommandBuffer::draw(const GrPipeline& pipeline,
+                              const GrPrimitiveProcessor& primProc,
+                              const GrMesh* mesh,
+                              int meshCount) {
+    if (primProc.numAttribs() > this->gpu()->caps()->maxVertexAttributes()) {
+        this->gpu()->stats()->incNumFailedDraws();
+        return false;
+    }
+    this->onDraw(pipeline, primProc, mesh, meshCount);
+    return true;
+}
+