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diff --git a/gfx/layers/basic/BasicCompositor.h b/gfx/layers/basic/BasicCompositor.h
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+++ b/gfx/layers/basic/BasicCompositor.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZILLA_GFX_BASICCOMPOSITOR_H
+#define MOZILLA_GFX_BASICCOMPOSITOR_H
+
+#include "mozilla/layers/Compositor.h"
+#include "mozilla/layers/TextureHost.h"
+#include "mozilla/gfx/2D.h"
+
+namespace mozilla {
+namespace layers {
+
+class BasicCompositingRenderTarget : public CompositingRenderTarget
+{
+public:
+  BasicCompositingRenderTarget(gfx::DrawTarget* aDrawTarget, const gfx::IntRect& aRect)
+    : CompositingRenderTarget(aRect.TopLeft())
+    , mDrawTarget(aDrawTarget)
+    , mSize(aRect.Size())
+  { }
+
+  virtual const char* Name() const override { return "BasicCompositingRenderTarget"; }
+
+  virtual gfx::IntSize GetSize() const override { return mSize; }
+
+  void BindRenderTarget();
+
+  virtual gfx::SurfaceFormat GetFormat() const override
+  {
+    return mDrawTarget ? mDrawTarget->GetFormat()
+                       : gfx::SurfaceFormat(gfx::SurfaceFormat::UNKNOWN);
+  }
+
+  RefPtr<gfx::DrawTarget> mDrawTarget;
+  gfx::IntSize mSize;
+};
+
+class BasicCompositor : public Compositor
+{
+public:
+  explicit BasicCompositor(CompositorBridgeParent* aParent, widget::CompositorWidget* aWidget);
+
+protected:
+  virtual ~BasicCompositor();
+
+public:
+
+  virtual BasicCompositor* AsBasicCompositor() override { return this; }
+
+  virtual bool Initialize(nsCString* const out_failureReason) override;
+
+  virtual void DetachWidget() override;
+
+  virtual TextureFactoryIdentifier GetTextureFactoryIdentifier() override;
+
+  virtual already_AddRefed<CompositingRenderTarget>
+  CreateRenderTarget(const gfx::IntRect &aRect, SurfaceInitMode aInit) override;
+
+  virtual already_AddRefed<CompositingRenderTarget>
+  CreateRenderTargetFromSource(const gfx::IntRect &aRect,
+                               const CompositingRenderTarget *aSource,
+                               const gfx::IntPoint &aSourcePoint) override;
+
+  virtual already_AddRefed<CompositingRenderTarget>
+  CreateRenderTargetForWindow(const LayoutDeviceIntRect& aRect,
+                              const LayoutDeviceIntRect& aClearRect,
+                              BufferMode aBufferMode);
+
+  virtual already_AddRefed<DataTextureSource>
+  CreateDataTextureSource(TextureFlags aFlags = TextureFlags::NO_FLAGS) override;
+
+  virtual already_AddRefed<DataTextureSource>
+  CreateDataTextureSourceAround(gfx::DataSourceSurface* aSurface) override;
+
+  virtual already_AddRefed<DataTextureSource>
+  CreateDataTextureSourceAroundYCbCr(TextureHost* aTexture) override;
+
+  virtual bool SupportsEffect(EffectTypes aEffect) override;
+
+  virtual void SetRenderTarget(CompositingRenderTarget *aSource) override
+  {
+    mRenderTarget = static_cast<BasicCompositingRenderTarget*>(aSource);
+    mRenderTarget->BindRenderTarget();
+  }
+  virtual CompositingRenderTarget* GetCurrentRenderTarget() const override
+  {
+    return mRenderTarget;
+  }
+
+  virtual void DrawQuad(const gfx::Rect& aRect,
+                        const gfx::IntRect& aClipRect,
+                        const EffectChain &aEffectChain,
+                        gfx::Float aOpacity,
+                        const gfx::Matrix4x4& aTransform,
+                        const gfx::Rect& aVisibleRect) override;
+
+  virtual void ClearRect(const gfx::Rect& aRect) override;
+
+  virtual void BeginFrame(const nsIntRegion& aInvalidRegion,
+                          const gfx::IntRect *aClipRectIn,
+                          const gfx::IntRect& aRenderBounds,
+                          const nsIntRegion& aOpaqueRegion,
+                          gfx::IntRect *aClipRectOut = nullptr,
+                          gfx::IntRect *aRenderBoundsOut = nullptr) override;
+  virtual void EndFrame() override;
+  virtual void EndFrameForExternalComposition(const gfx::Matrix& aTransform) override;
+
+  virtual bool SupportsPartialTextureUpdate() override { return true; }
+  virtual bool CanUseCanvasLayerForSize(const gfx::IntSize &aSize) override { return true; }
+  virtual int32_t GetMaxTextureSize() const override;
+  virtual void SetDestinationSurfaceSize(const gfx::IntSize& aSize) override { }
+  
+  virtual void SetScreenRenderOffset(const ScreenPoint& aOffset) override {
+  }
+
+  virtual void MakeCurrent(MakeCurrentFlags aFlags = 0) override { }
+
+#ifdef MOZ_DUMP_PAINTING
+  virtual const char* Name() const override { return "Basic"; }
+#endif // MOZ_DUMP_PAINTING
+
+  virtual LayersBackend GetBackendType() const override {
+    return LayersBackend::LAYERS_BASIC;
+  }
+
+  gfx::DrawTarget *GetDrawTarget() { return mDrawTarget; }
+
+  virtual bool IsPendingComposite() override
+  {
+    return mIsPendingEndRemoteDrawing;
+  }
+
+  virtual void FinishPendingComposite() override;
+
+private:
+
+  void TryToEndRemoteDrawing(bool aForceToEnd = false);
+
+  bool NeedsToDeferEndRemoteDrawing();
+
+  // The final destination surface
+  RefPtr<gfx::DrawTarget> mDrawTarget;
+  // The current render target for drawing
+  RefPtr<BasicCompositingRenderTarget> mRenderTarget;
+
+  LayoutDeviceIntRect mInvalidRect;
+  LayoutDeviceIntRegion mInvalidRegion;
+  bool mDidExternalComposition;
+
+  uint32_t mMaxTextureSize;
+  bool mIsPendingEndRemoteDrawing;
+};
+
+BasicCompositor* AssertBasicCompositor(Compositor* aCompositor);
+
+} // namespace layers
+} // namespace mozilla
+
+#endif /* MOZILLA_GFX_BASICCOMPOSITOR_H */