gpu shader cache: Clarify lifetime/ownership/threadiness of objects.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 238 matching lines @@
 namespace {
 
 const char kSiteProcessMapKeyName[] = "content_site_process_map";
 
 #ifdef ENABLE_WEBRTC
 const base::FilePath::CharType kAecDumpFileNameAddition[] =
     FILE_PATH_LITERAL("aec_dump");
 #endif
 
 void CacheShaderInfo(int32_t id, base::FilePath path) {
-  ShaderCacheFactory::GetInstance()->SetCacheInfo(id, path);
+  if (ShaderCacheFactory::GetInstance())
+    ShaderCacheFactory::GetInstance()->SetCacheInfo(id, path);
 }
 
 void RemoveShaderInfo(int32_t id) {
-  ShaderCacheFactory::GetInstance()->RemoveCacheInfo(id);
+  if (ShaderCacheFactory::GetInstance())
+    ShaderCacheFactory::GetInstance()->RemoveCacheInfo(id);
 }
 
 net::URLRequestContext* GetRequestContext(
     scoped_refptr<net::URLRequestContextGetter> request_context,
     scoped_refptr<net::URLRequestContextGetter> media_request_context,
     ResourceType resource_type) {
   // If the request has resource type of RESOURCE_TYPE_MEDIA, we use a request
   // context specific to media for handling it because these resources have
   // specific needs for caching.
   if (resource_type == RESOURCE_TYPE_MEDIA)
@@ skipping 2702 matching lines @@
   LOG(ERROR) << "Terminating render process for bad Mojo message: " << error;
 
   // The ReceivedBadMessage call below will trigger a DumpWithoutCrashing. Alias
   // enough information here so that we can determine what the bad message was.
   base::debug::Alias(&error);
   bad_message::ReceivedBadMessage(render_process_id,
                                   bad_message::RPH_MOJO_PROCESS_ERROR);
 }
 
 }  // namespace content