Use SkImage snapshots for ImageBufferSurface texture access

Source/platform/graphics/Canvas2DImageBufferSurface.h

Index: Source/platform/graphics/Canvas2DImageBufferSurface.h
diff --git a/Source/platform/graphics/Canvas2DImageBufferSurface.h b/Source/platform/graphics/Canvas2DImageBufferSurface.h
index 48e09315c83f183bae4e750af9179a55ee331c80..8bd12731d4f52bed49388476b0b8abde3c29f6c7 100644
--- a/Source/platform/graphics/Canvas2DImageBufferSurface.h
+++ b/Source/platform/graphics/Canvas2DImageBufferSurface.h
@@ -61,9 +61,9 @@ public:
     bool isValid() const override { return m_layerBridge && m_layerBridge->checkSurfaceValid(); }
     bool restore() override { return m_layerBridge->restoreSurface(); }
     WebLayer* layer() const override { return m_layerBridge->layer(); }
-    Platform3DObject getBackingTexture() const override { return m_layerBridge->getBackingTexture(); }
+    PassRefPtr<SkImage> getBackingTextureImage() const override { return m_layerBridge->getBackingTextureImage(); }
     bool isAccelerated() const override { return m_layerBridge->isAccelerated(); }
-    void setFilterQuality(SkFilterQuality filterQuality) override { m_layerBridge->setFilterQuality(filterQuality); };
+    void setFilterQuality(SkFilterQuality filterQuality) override { m_layerBridge->setFilterQuality(filterQuality); }
     void setIsHidden(bool hidden) override { m_layerBridge->setIsHidden(hidden); }
     void setImageBuffer(ImageBuffer* imageBuffer) override { m_layerBridge->setImageBuffer(imageBuffer); }
     void didDraw(const FloatRect& rect) override { m_layerBridge->didDraw(); }