GPU workaround to simulate Out of Memory errors with large textures

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 9054 matching lines @@
   }
   const void* pixels = NULL;
   if (pixels_shm_id != 0 || pixels_shm_offset != 0) {
     pixels = GetSharedMemoryAs<const void*>(
         pixels_shm_id, pixels_shm_offset, pixels_size);
     if (!pixels) {
       return error::kOutOfBounds;
     }
   }
 
+  // For testing only. Allows us to stress the ability to respond to OOM errors.
+  if (workarounds().simulate_out_of_memory_on_large_textures &&
+      (width * height >= 4096 * 4096)) {
+    LOCAL_SET_GL_ERROR(
+        GL_OUT_OF_MEMORY,
+        "glTexImage2D", "synthetic out of memory");
+    return error::kNoError;
+  }
+
   TextureManager::DoTextImage2DArguments args = {
     target, level, internal_format, width, height, border, format, type,
     pixels, pixels_size};
   texture_manager()->ValidateAndDoTexImage2D(
       &texture_state_, &state_, &framebuffer_state_, args);
 
   // This may be a slow command.  Exit command processing to allow for
   // context preemption and GPU watchdog checks.
   ExitCommandProcessingEarly();
   return error::kNoError;
@@ skipping 3474 matching lines @@
   }
 }
 
 // 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