Use a valid /prefetch argument when launching a process.

content/browser/plugin_process_host.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 "content/browser/plugin_process_host.h"
 
 #include <stddef.h>
 
 #include <utility>
 #include <vector>
@@ skipping 29 matching lines @@
 #include "content/public/common/sandboxed_process_launcher_delegate.h"
 #include "ipc/ipc_switches.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/switches.h"
 #include "ui/gl/gl_switches.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
+#include "content/public/common/prefetch_argument_win.h"
 #endif
 
 #if defined(OS_MACOSX)
 #include "base/mac/mac_util.h"
 #include "ui/gfx/geometry/rect.h"
 #endif
 
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
 #include "content/common/plugin_constants_win.h"
@@ skipping 142 matching lines @@
   base::FilePath exe_path = ChildProcessHost::GetChildPath(flags);
   if (exe_path.empty())
     return false;
 
   base::CommandLine* cmd_line = new base::CommandLine(exe_path);
   // Put the process type and plugin path first so they're easier to see
   // in process listings using native process management tools.
   cmd_line->AppendSwitchASCII(switches::kProcessType, switches::kPluginProcess);
   cmd_line->AppendSwitchPath(switches::kPluginPath, info.path);
 
+#if defined(OS_WIN)
+  AddWindowsPrefetchArgument(PREFETCH_ID_DEFAULT, cmd_line);

[gab, 2016/01/21 20:22:59]

How about "PREFETCH_ID_OTHER" (i.e. to me "default" is the browser process'
while "other" is clear it's for things we don't care much about).

+#endif  // defined(OS_WIN)
+
   // Propagate the following switches to the plugin command line (along with
   // any associated values) if present in the browser command line
   static const char* const kSwitchNames[] = {
     switches::kDisableBreakpad,
     switches::kDisableDirectNPAPIRequests,
     switches::kEnableStatsTable,
     switches::kFullMemoryCrashReport,
     switches::kLoggingLevel,
     switches::kLogPluginMessages,
     switches::kNoSandbox,
@@ skipping 206 matching lines @@
 void PluginProcessHost::GetContexts(ResourceType resource_type,
                                     int origin_pid,
                                     ResourceContext** resource_context,
                                     net::URLRequestContext** request_context) {
   *resource_context =
       resource_context_map_[origin_pid].resource_context;
   *request_context = (*resource_context)->GetRequestContext();
 }
 
 }  // namespace content