Teach SkyShell how to draw with Ganesh

sky/shell/gpu/ganesh_context.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SKY_SHELL_GPU_GANESH_CONTEXT_H_
+#define SKY_SHELL_GPU_GANESH_CONTEXT_H_
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "skia/ext/refptr.h"
+#include "third_party/skia/include/gpu/GrContext.h"
+#include "ui/gl/gl_context.h"
+
+namespace sky {
+namespace shell {
+
+class GaneshContext {
+ public:
+  explicit GaneshContext(scoped_refptr<gfx::GLContext> gl_context);
+  ~GaneshContext();
+
+  GrContext* gr() const { return gr_context_.get(); }

[eseidel, 2015/02/01 08:31:34]

i wouldn't know what this is reading it.

[abarth-chromium, 2015/02/01 08:34:17]

GrContext is the top-level context object for Ganesh.  The whole Ganesh system
in Skia uses the "Gr" prefix, so this is is the "context for gr" i.e. the
context for Ganesh.

I'll add a comment.

+
+ private:
+  scoped_refptr<gfx::GLContext> gl_context_;
+  skia::RefPtr<GrContext> gr_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(GaneshContext);
+};
+
+}  // namespace shell
+}  // namespace sky
+
+#endif  // SKY_SHELL_GPU_GANESH_CONTEXT_H_