registerContextExtensions   96 Source/core/html/canvas/WebGLRenderingContext.cpp     renderingContext->registerContextExtensions();
registerContextExtensions   41 Source/core/html/canvas/WebGLRenderingContext.h     virtual void registerContextExtensions() OVERRIDE;
registerContextExtensions  105 Source/core/html/canvas/WebGLRenderingContextBase.h     virtual void registerContextExtensions() = 0;