Add eglGetProcAddress to pgl.

gpu/pgl/pgl.h

 // Copyright (c) 2010 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 GPU_PGL_PGL_H
 #define GPU_PGL_PGL_H
 
 #include <npapi.h>
 #include <npapi_extensions.h>
 
@@ skipping 31 matching lines @@
 PGLContext pglCreateContext(NPP npp,
                             NPDevice* device,
                             NPDeviceContext3D* device_context);
 
 // Set the current PGL context for the calling thread.
 PGLBoolean pglMakeCurrent(PGLContext pgl_context);
 
 // Get the calling thread's current PGL context.
 PGLContext pglGetCurrentContext(void);
 
+// Gets the address of a function.
+void (*pglGetProcAddress(char const * procname))();
+
 // Display everything that has been rendered since the last call.
 PGLBoolean pglSwapBuffers(void);
 
 // Destroy the given PGL context.
 PGLBoolean pglDestroyContext(PGLContext pgl_context);
 
 // Return the current PGL error.
 PGLInt pglGetError();
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // GPU_PGL_PGL_H