getClearBitsByFormat 1400 Source/core/html/canvas/WebGLRenderingContextBase.cpp     if (WebGLImageConversion::getClearBitsByFormat(format) & (GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT)) {
getClearBitsByFormat  131 Source/platform/graphics/gpu/WebGLImageConversion.h     static unsigned getClearBitsByFormat(GLenum);