WebGL: Return both unprefixed and prefixed supported names from getSupportedExtensions

Source/core/html/canvas/WebGLRenderingContextBase.h

 /*
  * 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 514 matching lines @@
 
     bool m_multisamplingAllowed;
     bool m_multisamplingObserverRegistered;
 
     GLuint m_onePlusMaxEnabledAttribIndex;
     unsigned long m_onePlusMaxNonDefaultTextureUnit;
 
     OwnPtr<Extensions3DUtil> m_extensionsUtil;
 
     enum ExtensionFlags {
-        ApprovedExtension   = 0x00,
-        DraftExtension      = 0x01,
-        PrivilegedExtension = 0x02,
-        PrefixedExtension   = 0x04,
+        ApprovedExtension               = 0x00,
+        DraftExtension                  = 0x01, // Extension that is behind the draft extensions runtime flag.
+        PrivilegedExtension             = 0x02,
+        EnabledDraftExtension           = 0x04, // Extension that is still in draft state, but has been selectively enabled by default.

[Ken Russell (switch to Gerrit), 2014/03/25 18:21:11]

Please update this comment to say something like

"...selectively enabled by default under a prefix. Do not use this for enabling
new draft extensions; use the DraftExtension flag instead, and do not use vendor
prefixes."

         WebGLDebugRendererInfoExtension = 0x08,
     };
 
     class ExtensionTracker {
     public:
         ExtensionTracker(ExtensionFlags flags, const char* const* prefixes)
             : m_privileged(flags & PrivilegedExtension)
             , m_draft(flags & DraftExtension)
-            , m_prefixed(flags & PrefixedExtension)
             , m_webglDebugRendererInfo(flags & WebGLDebugRendererInfoExtension)
             , m_prefixes(prefixes)
         {
         }
 
         virtual ~ExtensionTracker()
         {
         }
 
-        bool prefixed() const
-        {
-            return m_prefixed;
-        }
-
         bool privileged() const
         {
             return m_privileged;
         }
 
         bool draft() const
         {
             return m_draft;
         }
 
         bool webglDebugRendererInfo() const
         {
             return m_webglDebugRendererInfo;
         }
 
+        const char* const* prefixes() const;
         bool matchesNameWithPrefixes(const String&) const;
 
         virtual PassRefPtr<WebGLExtension> getExtension(WebGLRenderingContextBase*) = 0;
         virtual bool supported(WebGLRenderingContextBase*) const = 0;
         virtual const char* extensionName() const = 0;
         virtual void loseExtension() = 0;
 
     private:
         bool m_privileged;
         bool m_draft;
-        bool m_prefixed;
         bool m_webglDebugRendererInfo;
         const char* const* m_prefixes;
     };
 
     template <typename T>
     class TypedExtensionTracker FINAL : public ExtensionTracker {
     public:
         TypedExtensionTracker(RefPtr<T>& extensionField, ExtensionFlags flags, const char* const* prefixes)
             : ExtensionTracker(flags, prefixes)
             , m_extensionField(extensionField)
@@ skipping 47 matching lines @@
 
     bool m_extensionEnabled[WebGLExtensionNameCount];
     Vector<ExtensionTracker*> m_extensions;
 
     template <typename T>
     void registerExtension(RefPtr<T>& extensionPtr, ExtensionFlags flags = ApprovedExtension, const char* const* prefixes = 0)
     {
         m_extensions.append(new TypedExtensionTracker<T>(extensionPtr, flags, prefixes));
     }
 
+    bool extensionSupportedAndAllowed(const ExtensionTracker*);
+
     inline bool extensionEnabled(WebGLExtensionName name)
     {
         return m_extensionEnabled[name];
     }
 
     // Errors raised by synthesizeGLError() while the context is lost.
     Vector<GLenum> m_lostContextErrors;
 
     // Helpers for getParameter and others
     WebGLGetInfo getBooleanParameter(GLenum);
@@ skipping 251 matching lines @@
     // If the vector is empty, return the maximum allowed active context number.
     static size_t oldestContextIndex();
     static IntSize oldestContextSize();
 };
 
 DEFINE_TYPE_CASTS(WebGLRenderingContextBase, CanvasRenderingContext, context, context->is3d(), context.is3d());
 
 } // namespace WebCore
 
 #endif // WebGLRenderingContextBase_h