Reland "webgl: use immutable texture for the default FBO."

third_party/WebKit/Source/modules/webgl/WebGLRenderingContext.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 105 matching lines @@
 
     return renderingContext;
 }
 
 void WebGLRenderingContext::Factory::onError(HTMLCanvasElement* canvas, const String& error)
 {
     canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, error));
 }
 
 WebGLRenderingContext::WebGLRenderingContext(HTMLCanvasElement* passedCanvas, std::unique_ptr<WebGraphicsContext3DProvider> contextProvider, const WebGLContextAttributes& requestedAttributes)
-    : WebGLRenderingContextBase(passedCanvas, std::move(contextProvider), requestedAttributes)
+    : WebGLRenderingContextBase(passedCanvas, std::move(contextProvider), requestedAttributes, 1)
 {
 }
 
 WebGLRenderingContext::WebGLRenderingContext(OffscreenCanvas* passedOffscreenCanvas, std::unique_ptr<WebGraphicsContext3DProvider> contextProvider, const WebGLContextAttributes& requestedAttributes)
-    : WebGLRenderingContextBase(passedOffscreenCanvas, std::move(contextProvider), requestedAttributes)
+    : WebGLRenderingContextBase(passedOffscreenCanvas, std::move(contextProvider), requestedAttributes, 1)
 {
 }
 
 WebGLRenderingContext::~WebGLRenderingContext()
 {
 }
 
 void WebGLRenderingContext::setCanvasGetContextResult(RenderingContext& result)
 {
     result.setWebGLRenderingContext(this);
@@ skipping 90 matching lines @@
     visitor->traceWrappers(m_webglDebugShaders);
     visitor->traceWrappers(m_webglDrawBuffers);
     visitor->traceWrappers(m_webglCompressedTextureASTC);
     visitor->traceWrappers(m_webglCompressedTextureATC);
     visitor->traceWrappers(m_webglCompressedTextureETC1);
     visitor->traceWrappers(m_webglCompressedTexturePVRTC);
     visitor->traceWrappers(m_webglCompressedTextureS3TC);
     visitor->traceWrappers(m_webglDepthTexture);
 }
 } // namespace blink