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

cc/grcontext_provider.h

+// 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"
+#include "skia/ext/refptr.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
+
+class GrContext;
+
+namespace cc {
+class ResourceProvider;
+
+class CC_EXPORT GrContextProvider
+    : public WebKit::WebGraphicsContext3D::
+          WebGraphicsMemoryAllocationChangedCallbackCHROMIUM {
+ public:
+  GrContextProvider();
+  virtual ~GrContextProvider();
+
+  void SetContext3d(WebKit::WebGraphicsContext3D* context3d);
+
+  bool has_contexts() { return context3d_ && gr_context_; }
+
+  class CC_EXPORT ScopedContexts {
+   public:
+    explicit ScopedContexts(GrContextProvider* grcontext_provider);
+    ~ScopedContexts();
+
+    WebKit::WebGraphicsContext3D* context3d() {
+      return grcontext_provider_->context3d_;
+    }
+    GrContext* gr_context() {
+      return grcontext_provider_->gr_context_.get();
+    }
+
+   protected:
+    GrContextProvider* grcontext_provider_;
+  };
+
+  class CC_EXPORT ScopedContextsFlushed : public ScopedContexts {
+   public:
+    ScopedContextsFlushed(ResourceProvider* resource_provider,
+                          GrContextProvider* grcontext_provider);
+    ~ScopedContextsFlushed();
+  };
+
+ private:
+  void SetGaneshContextMemoryLimit(bool nonzero_allocation);
+
+  // TODO(danakj): Move this to content/
+  // WebGraphicsMemoryAllocationChangedCallbackCHROMIUM implementation.
+  virtual void onMemoryAllocationChanged(
+      WebKit::WebGraphicsMemoryAllocation allocation) OVERRIDE;
+
+  WebKit::WebGraphicsContext3D* context3d_;
+  skia::RefPtr<GrContext> gr_context_;
+};
+
+}  // namespace cc
+
+#endif  // CC_GRCONTEXT_PROVIDER_H_