Plumbed in discard_framebuffer extension

src/gpu/gl/GrGLInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLExtensions.h"
@@ skipping 277 matching lines @@
             if (NULL == fTexStorage2D) {
                 return false;
             }
         }
     } else if (extensions.has("GL_EXT_texture_storage")) {
         if (NULL == fTexStorage2D) {
             return false;
         }
     }
 
+    if (extensions.has("GL_EXT_discard_framebuffer")) {
+// FIXME: Remove this once Chromium is updated to provide this function
+#if 0
+        if (NULL == fDiscardFramebuffer) {
+            return false;
+        }
+#endif
+    }
+
     // FBO MSAA
     if (kDesktop_GrGLBinding == binding) {
         // GL 3.0 and the ARB extension have multisample + blit
         if (glVer >= GR_GL_VER(3,0) || extensions.has("GL_ARB_framebuffer_object")) {
             if (NULL == fRenderbufferStorageMultisample ||
                 NULL == fBlitFramebuffer) {
                 return false;
             }
         } else {
             if (extensions.has("GL_EXT_framebuffer_blit") &&
@@ skipping 63 matching lines @@
             if (NULL == fBindVertexArray ||
                 NULL == fDeleteVertexArrays ||
                 NULL == fGenVertexArrays) {
                 return false;
             }
         }
     }
 
     return true;
 }