Hook ANGLE_request_extension up to the passthrough cmd decoder.

third_party/WebKit/Source/platform/graphics/gpu/Extensions3DUtil.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef Extensions3DUtil_h
 #define Extensions3DUtil_h
 
 #include "platform/PlatformExport.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "wtf/Allocator.h"
@@ skipping 19 matching lines @@
   // Creates a new Extensions3DUtil. If the passed GLES2Interface has been
   // spontaneously lost, returns null.
   static std::unique_ptr<Extensions3DUtil> create(gpu::gles2::GLES2Interface*);
   ~Extensions3DUtil();
 
   bool isValid() { return m_isValid; }
 
   bool supportsExtension(const String& name);
   bool ensureExtensionEnabled(const String& name);
   bool isExtensionEnabled(const String& name);
+  bool isExtensionRequestable(const String& name);
 
   static bool canUseCopyTextureCHROMIUM(GLenum destTarget,
                                         GLenum destFormat,
                                         GLenum destType,
                                         GLint level);
 
  private:
   Extensions3DUtil(gpu::gles2::GLES2Interface*);
   void initializeExtensions();
 
   gpu::gles2::GLES2Interface* m_gl;
   HashSet<String> m_enabledExtensions;
   HashSet<String> m_requestableExtensions;
   bool m_isValid;
 };
 
 }  // namespace blink
 
 #endif  // Extensions3DUtil_h