Teach SkyShell how to draw with Ganesh

sky/shell/gpu/ganesh_context.cc

+// 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.
+
+#include "sky/shell/gpu/ganesh_context.h"
+
+#include "base/logging.h"
+#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
+#include "ui/gl/gl_bindings_skia_in_process.h"
+
+namespace sky {
+namespace shell {
+namespace {
+
+// The limit of the number of GPU resources we hold in the GrContext's
+// GPU cache.
+const int kMaxGaneshResourceCacheCount = 2048;
+
+// The limit of the bytes allocated toward GPU resources in the GrContext's
+// GPU cache.
+const size_t kMaxGaneshResourceCacheBytes = 96 * 1024 * 1024;
+
+}  // namespace
+
+GaneshContext::GaneshContext(scoped_refptr<gfx::GLContext> gl_context)
+    : gl_context_(gl_context) {
+  skia::RefPtr<GrGLInterface> interface =
+      skia::AdoptRef(gfx::CreateInProcessSkiaGLBinding());
+  DCHECK(interface);
+
+  gr_context_ = skia::AdoptRef(GrContext::Create(
+      kOpenGL_GrBackend, reinterpret_cast<GrBackendContext>(interface.get())));
+  DCHECK(gr_context_);
+  gr_context_->setResourceCacheLimits(kMaxGaneshResourceCacheCount,
+                                      kMaxGaneshResourceCacheBytes);
+}
+
+GaneshContext::~GaneshContext() {
+}
+
+}  // namespace shell
+}  // namespace sky