Make WebGL extensions get lost when context is lost.

Source/core/html/canvas/WebGLDebugShaders.cpp

 /*
  * Copyright (C) 2011 Google 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
@@ skipping 21 matching lines @@
 #include "core/platform/graphics/Extensions3D.h"
 
 #include <wtf/OwnArrayPtr.h>
 
 namespace WebCore {
 
 WebGLDebugShaders::WebGLDebugShaders(WebGLRenderingContext* context)
     : WebGLExtension(context)
 {
     ScriptWrappable::init(this);
+    enable();
 }
 
 WebGLDebugShaders::~WebGLDebugShaders()
 {
 }
 
+void WebGLDebugShaders::enable()
+{
+}
+
 WebGLExtension::ExtensionName WebGLDebugShaders::getName() const
 {
     return WebGLDebugShadersName;
 }
 
 PassOwnPtr<WebGLDebugShaders> WebGLDebugShaders::create(WebGLRenderingContext* context)
 {
     return adoptPtr(new WebGLDebugShaders(context));
 }
 
 String WebGLDebugShaders::getTranslatedShaderSource(WebGLShader* shader, ExceptionCode& ec)
 {
     UNUSED_PARAM(ec);
-    if (m_context->isContextLost())
+    if (isLost())
         return String();
     if (!m_context->validateWebGLObject("getTranslatedShaderSource", shader))
         return "";
     return m_context->graphicsContext3D()->getExtensions()->getTranslatedShaderSourceANGLE(shader->object());
 }
 
 bool WebGLDebugShaders::supported(WebGLRenderingContext* context)
 {
     Extensions3D* extensions = context->graphicsContext3D()->getExtensions();
     return extensions->supports("GL_ANGLE_translated_shader_source");
 }
 
 const char* WebGLDebugShaders::getExtensionName()
 {
     return "WEBGL_debug_shaders";
 }
 
 } // namespace WebCore