Merge 199256 "gpu: Make sure external texture destination is ini..."

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
===================================================================
--- gpu/command_buffer/service/gles2_cmd_decoder.cc	(revision 199692)
+++ gpu/command_buffer/service/gles2_cmd_decoder.cc	(working copy)
@@ -9705,7 +9705,15 @@
 
   // 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;
   }