gpu: Make sure external texture destination is initialized

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // 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.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 9609 matching lines @@
   bool dest_level_defined = dest_texture->GetLevelSize(
       GL_TEXTURE_2D, level, &dest_width, &dest_height);
 
   if (dest_level_defined) {
     dest_texture->GetLevelType(GL_TEXTURE_2D, level, &dest_type_previous,
                                &dest_internal_format);
   }
 
   // Set source texture's width and height to be the same as
   // destination texture when source is GL_TEXTURE_EXTERNAL_OES.
+  // TODO(hkuang): Add support to get width/height of StreamTexture
+  // crbug.com/225781.
   if (source_texture->target() == GL_TEXTURE_EXTERNAL_OES) {
+    if (!dest_level_defined) {
+      LOCAL_SET_GL_ERROR(
+          GL_INVALID_VALUE,
+          "glCopyTextureCHROMIUM", "destination level not defined");
+      return;
+    }
     source_width = dest_width;
     source_height = dest_height;
   }
 
   // Resize the destination texture to the dimensions of the source texture.
   if (!dest_level_defined || dest_width != source_width ||
       dest_height != source_height ||
       dest_internal_format != internal_format ||
       dest_type_previous != dest_type) {
     // Ensure that the glTexImage2D succeeds.
@@ skipping 691 matching lines @@
   return error::kNoError;
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu