Add initial support for NV_path_rendering extension to gpu command buffer

gpu/GLES2/gl2extchromium.h

Index: gpu/GLES2/gl2extchromium.h
diff --git a/gpu/GLES2/gl2extchromium.h b/gpu/GLES2/gl2extchromium.h
index 0eb89ce84b294d649cd77e4c8e0b7d4f581b6ab7..e95158d43f4a7dea6cea39d309145eedb18e6d9e 100644
--- a/gpu/GLES2/gl2extchromium.h
+++ b/gpu/GLES2/gl2extchromium.h
@@ -636,6 +636,21 @@ typedef void (GL_APIENTRYP PFNGLWAITSYNCPOINTCHROMIUMPROC) (GLuint sync_point);
 #endif
 #endif /* GL_CHROMIUM_color_buffer_float_rgb */
 
+#ifndef GL_CHROMIUM_NV_path_rendering
+#define GL_CHROMIUM_NV_path_rendering 1
+
+#ifdef GL_GLEXT_PROTOTYPES
+GL_APICALL void GL_APIENTRY glMatrixMode(GLenum mode);
+GL_APICALL void GL_APIENTRY glLoadMatrixf(const GLfloat* m);
+GL_APICALL void GL_APIENTRY glLoadIdentity();
+#endif
+
+typedef void (GL_APIENTRYP PFNGLMATRIXMODEPROC) (GLenum mode);
+typedef void (GL_APIENTRYP PFNGLLOADMATRIXFPROC) (const GLfloat* m);
+typedef void (GL_APIENTRYP PFNGLLOADIDENTITYPROC) ();
+
+#endif /* GL_CHROMIUM_NV_path_rendering */
+
 #ifdef __cplusplus
 }
 #endif