ensureNotNull      61 Source/core/html/canvas/WebGLDebugShaders.cpp     return m_context->ensureNotNull(m_context->webGraphicsContext3D()->getTranslatedShaderSourceANGLE(shader->object()));
ensureNotNull    2473 Source/core/html/canvas/WebGLRenderingContextBase.cpp     return ensureNotNull(m_context->getProgramInfoLog(objectOrZero(program)));
ensureNotNull    2543 Source/core/html/canvas/WebGLRenderingContextBase.cpp     return ensureNotNull(m_context->getShaderInfoLog(objectOrZero(shader)));
ensureNotNull    2583 Source/core/html/canvas/WebGLRenderingContextBase.cpp     return ensureNotNull(shader->source());
ensureNotNull     877 Source/core/html/canvas/WebGLRenderingContextBase.h     String ensureNotNull(const String&) const;