cc: Route offscreen context creation for compositor to the browser.

cc/grcontext_provider.h

Index: cc/grcontext_provider.h
diff --git a/cc/grcontext_provider.h b/cc/grcontext_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..f118f1c345db92a5276109b76e44bc2f6f471d19
--- /dev/null
+++ b/cc/grcontext_provider.h
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+// Copyright 2013 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 CC_GRCONTEXT_PROVIDER_H_
+#define CC_GRCONTEXT_PROVIDER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "cc/cc_export.h"
+
+class GrContext;
+namespace WebKit { class WebGraphicsContext3D; }
+
+namespace cc {
+class ResourceProvider;
+
+class CC_EXPORT GrContextProvider {
+ public:
+  GrContextProvider(ResourceProvider* resource_provider);
+  virtual ~GrContextProvider();
+
+  void set_contexts(WebKit::WebGraphicsContext3D* context3d,
+                    GrContext* gr_context) {
+    context3d_ = context3d;
+    gr_context_ = gr_context;
+  }
+
+  bool has_contexts() { return context3d_ && gr_context_; }
+
+  WebKit::WebGraphicsContext3D* context3d() {
+    return context3d_;
+  }
+  GrContext* gr_context() {
+    return gr_context_;
+  }
+
+  void BeginUsingContexts();
+  void FinishUsingContexts();
+
+ private:
+  ResourceProvider* resource_provider_;
+  WebKit::WebGraphicsContext3D* context3d_;
+  GrContext* gr_context_;
+};
+
+}  // namespace cc
+
+#endif  // CC_GRCONTEXT_PROVIDER_H_