gpu: Fix some context lost marking glitches+leaks and add UMA stats

gpu/command_buffer/service/context_group.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/context_group.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 342 matching lines @@
   uint32 total = 0;
   if (buffer_manager_.get())
     total += buffer_manager_->mem_represented();
   if (renderbuffer_manager_.get())
     total += renderbuffer_manager_->mem_represented();
   if (texture_manager_.get())
     total += texture_manager_->mem_represented();
   return total;
 }
 
-void ContextGroup::LoseContexts(GLenum reset_status) {
+void ContextGroup::LoseContexts(error::ContextLostReason reason) {
   for (size_t ii = 0; ii < decoders_.size(); ++ii) {
     if (decoders_[ii].get()) {
-      decoders_[ii]->LoseContext(reset_status);
+      decoders_[ii]->MarkContextLost(reason);
     }
   }
 }
 
 ContextGroup::~ContextGroup() {
   CHECK(!HaveContexts());
 }
 
 bool ContextGroup::CheckGLFeature(GLint min_required, GLint* v) {
   GLint value = *v;
@@ skipping 34 matching lines @@
     GLuint client_id, GLuint* service_id) const {
   Buffer* buffer = buffer_manager_->GetBuffer(client_id);
   if (!buffer)
     return false;
   *service_id = buffer->service_id();
   return true;
 }
 
 }  // namespace gles2
 }  // namespace gpu