DrawingBuffer: Clean up GL state restoration

third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h

Index: third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h
diff --git a/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h b/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h
index 5749eb9c1b70a3d70e1dd81ae73a932c6d8baa02..dc66a508b64a6090c5b7e328c4e15b511ff00f84 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h
@@ -743,6 +743,9 @@ class WebGL2RenderingContextBase : public WebGLRenderingContextBase {
       std::unique_ptr<WebGraphicsContext3DProvider>,
       const CanvasContextCreationAttributes& requestedAttributes);
 
+  // DrawingBuffer::Client implementation.
+  void DrawingBufferClientRestorePixelUnpackBufferBinding() override;
+
   // Helper function to validate target and the attachment combination for
   // getFramebufferAttachmentParameters.  Generate GL error and return false if
   // parameters are illegal.