Ensure that a ContextGroup is not destroyed if it was not correctly initialized.

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2011 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 1747 matching lines @@
   // Maybe create a short lived offscreen GLSurface for the purpose of
   // initializing the decoder's GLContext.
   surface_ = surface;
 
   // Take ownership of the GLContext.
   context_ = context;
 
   if (!MakeCurrent()) {
     LOG(ERROR) << "GLES2DecoderImpl::Initialize failed because "
                << "MakeCurrent failed.";
+    group_ = NULL;  // Must not destroy ContextGroup if it is not initialized.
     Destroy();
     return false;
   }
 
   if (!group_->Initialize(disallowed_features, allowed_extensions)) {
     LOG(ERROR) << "GpuScheduler::InitializeCommon failed because group "
                << "failed to initialize.";
+    group_ = NULL;  // Must not destroy ContextGroup if it is not initialized.
     Destroy();
     return false;
   }
 
   CHECK_GL_ERROR();
   disallowed_features_ = disallowed_features;
 
   vertex_attrib_manager_.Initialize(group_->max_vertex_attribs());
 
   util_.set_num_compressed_texture_formats(
@@ skipping 622 matching lines @@
     if (offscreen_saved_frame_buffer_.get())
       offscreen_saved_frame_buffer_->Invalidate();
     if (offscreen_saved_color_texture_.get())
       offscreen_saved_color_texture_->Invalidate();
     if (offscreen_resolved_frame_buffer_.get())
       offscreen_resolved_frame_buffer_->Invalidate();
     if (offscreen_resolved_color_texture_.get())
       offscreen_resolved_color_texture_->Invalidate();
   }
 
-  group_->Destroy(have_context);
-  group_ = NULL;
+  if (group_) {
+    group_->Destroy(have_context);
+    group_ = NULL;
+  }
 
   if (context_.get()) {
     context_->ReleaseCurrent(NULL);
     context_ = NULL;
   }
 
   offscreen_target_frame_buffer_.reset();
   offscreen_target_color_texture_.reset();
   offscreen_target_color_render_buffer_.reset();
   offscreen_target_depth_render_buffer_.reset();
@@ skipping 4658 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