Hook ANGLE_request_extension up to the passthrough cmd decoder.

ui/gl/gl_context.h

 // Copyright (c) 2012 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 UI_GL_GL_CONTEXT_H_
 #define UI_GL_GL_CONTEXT_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 129 matching lines @@
   // Returns the GL renderer string. The context must be current.
   virtual std::string GetGLRenderer();
 
   // Returns a helper structure to convert YUV textures to RGB textures.
   virtual YUVToRGBConverter* GetYUVToRGBConverter();
 
   // Get the CurrentGL object for this context containing the driver, version
   // and API.
   CurrentGL* GetCurrentGL();
 
+  // Reinitialize the dynamic bindings of this context.  Needed when the driver
+  // may be exposing different extensions compared to when it was initialized.
+  void ReinitializeDynamicBindings();
+
  protected:
   virtual ~GLContext();
 
   // Create the GLApi for this context using the provided driver. Creates a
   // RealGLApi by default.
   virtual GLApi* CreateGLApi(DriverGL* driver);
 
   // Will release the current context when going out of scope, unless canceled.
   class ScopedReleaseCurrent {
    public:
@@ skipping 70 matching lines @@
 // scoped_refptr containing the initialized GLContext or nullptr if
 // initialization fails.
 GL_EXPORT scoped_refptr<GLContext> InitializeGLContext(
     scoped_refptr<GLContext> context,
     GLSurface* compatible_surface,
     const GLContextAttribs& attribs);
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_CONTEXT_H_