content: Add public context creation API.

content/public/browser/android/compositor.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_ANDROID_COMPOSITOR_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_COMPOSITOR_H_
 
 #include "base/callback.h"
 #include "cc/resources/ui_resource_bitmap.h"
 #include "content/common/content_export.h"
+#include "gpu/ipc/common/surface_handle.h"
 #include "ui/android/resources/ui_resource_provider.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace cc {
+class ContextProvider;
 class Layer;
 }
 
+namespace gpu {
+namespace gles2 {
+struct ContextCreationAttribHelper;
+}  // namespace gles2
+
+struct SharedMemoryLimits;
+}
+
 namespace ui {
 class ResourceManager;
 class UIResourceProvider;
 }
 
 namespace content {
 class CompositorClient;
 
 // An interface to the browser-side compositor.
 class CONTENT_EXPORT Compositor {
  public:
   virtual ~Compositor() {}
 
   // Performs the global initialization needed before any compositor
   // instance can be used. This should be called only once.
   static void Initialize();
 
+  // Creates a GL context for the provided |handle|. If a null handle is passed,
+  // an offscreen context is created.
+  using ContextProviderCallback =
+      base::Callback<void(scoped_refptr<cc::ContextProvider>)>;
+  static void CreateContextProvider(
+      gpu::SurfaceHandle handle,
+      gpu::gles2::ContextCreationAttribHelper attributes,
+      gpu::SharedMemoryLimits shared_memory_limits,
+      ContextProviderCallback callback);
+
   // Creates and returns a compositor instance.  |root_window| needs to outlive
   // the compositor as it manages callbacks on the compositor.
   static Compositor* Create(CompositorClient* client,
                             gfx::NativeWindow root_window);
 
   // Attaches the layer tree.
   virtual void SetRootLayer(scoped_refptr<cc::Layer> root) = 0;
 
   // Set the output surface bounds.
   virtual void SetWindowBounds(const gfx::Size& size) = 0;
@@ skipping 14 matching lines @@
   // Returns the resource manager associated with the compositor.
   virtual ui::ResourceManager& GetResourceManager() = 0;
 
  protected:
   Compositor() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_COMPOSITOR_H_