Merge 185069 "Enforce context refrence guards in WebGL extensions."

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 35 matching lines @@
     return WebGLDebugShadersName;
 }
 
 PassRefPtrWillBeRawPtr<WebGLDebugShaders> WebGLDebugShaders::create(WebGLRenderingContextBase* context)
 {
     return adoptRefWillBeNoop(new WebGLDebugShaders(context));
 }
 
 String WebGLDebugShaders::getTranslatedShaderSource(WebGLShader* shader)
 {
-    if (isLost())
+    WebGLExtensionScopedContext scoped(this);
+    if (scoped.isLost())
         return String();
-    if (!m_context->validateWebGLObject("getTranslatedShaderSource", shader))
+    if (!scoped.context()->validateWebGLObject("getTranslatedShaderSource", shader))
         return "";
-    return m_context->ensureNotNull(m_context->webContext()->getTranslatedShaderSourceANGLE(shader->object()));
+    return scoped.context()->ensureNotNull(scoped.context()->webContext()->getTranslatedShaderSourceANGLE(shader->object()));
 }
 
 bool WebGLDebugShaders::supported(WebGLRenderingContextBase* context)
 {
     return context->extensionsUtil()->supportsExtension("GL_ANGLE_translated_shader_source");
 }
 
 const char* WebGLDebugShaders::extensionName()
 {
     return "WEBGL_debug_shaders";
 }
 
 } // namespace blink