Added directwrite warmup for PPAPI processes.

content/ppapi_plugin/ppapi_thread.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/ppapi_plugin/ppapi_thread.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/cpu.h"
 #include "base/debug/crash_logging.h"
 #include "base/files/file_util.h"
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/discardable_memory_allocator.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/rand_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 67 matching lines @@
 
       enum_sys_locales_ex(EnumLocalesProcEx, LOCALE_WINDOWS, 0, 0);
     } else {
       EnumSystemLocalesW(EnumLocalesProc, LCID_INSTALLED);
     }
   }
 }
 
 #endif
 
+typedef decltype(GetProcessMitigationPolicy)* GetProcessMitigationPolicyType;
+
+// Get win32k lockdown policy using a lazy instance so it's only initialized

[palmer, 2015/09/15 21:43:43]

This is copied and pasted from another CL, right? Rather than duplicating it,
put it in a shared location.

[forshaw, 2015/09/15 21:59:32]

I'd love to. Initially I had it in base but wfh@ recommended that would be a
hassle getting it into that from a maintainers perspective. So instead I moved
it to sandbox. But it turns out the skia code can't access sandbox code and I
felt it was probably unwise to change dependencies. So currently at a loss as
where best to put it. I could probably access the one in skia/ext from content,
but that seems a bit sketchy. If you've got a better idea for a place to dump it
I'm all for it.

+// once and is thread-safe.
+class LazyIsWin32kLockdownEnabled {
+ public:
+  LazyIsWin32kLockdownEnabled() : value_(IsWin32kLockdownEnabled()) {}
+
+  ~LazyIsWin32kLockdownEnabled() {}
+
+  bool value() { return value_; }
+
+ private:
+  static bool IsWin32kLockdownEnabled() {
+    GetProcessMitigationPolicyType get_process_mitigation_policy_func =
+        reinterpret_cast<GetProcessMitigationPolicyType>(GetProcAddress(
+            GetModuleHandle(L"kernel32.dll"), "GetProcessMitigationPolicy"));
+
+    if (!get_process_mitigation_policy_func)
+      return false;
+
+    PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY policy = {0};
+    if (get_process_mitigation_policy_func(GetCurrentProcess(),
+                                           ProcessSystemCallDisablePolicy,
+                                           &policy, sizeof(policy)))
+      return policy.DisallowWin32kSystemCalls != 0;
+
+    return false;
+  }
+
+  const bool value_;
+
+  DISALLOW_COPY_AND_ASSIGN(LazyIsWin32kLockdownEnabled);
+};
+
 namespace content {
 
+bool IsWin32kLockdownEnabled() {
+  static base::LazyInstance<LazyIsWin32kLockdownEnabled> win32k_lockdown =
+      LAZY_INSTANCE_INITIALIZER;
+  return win32k_lockdown.Get().value();
+}
+
 typedef int32_t (*InitializeBrokerFunc)
     (PP_ConnectInstance_Func* connect_instance_func);
 
 PpapiThread::PpapiThread(const base::CommandLine& command_line, bool is_broker)
     : is_broker_(is_broker),
       plugin_globals_(GetIOTaskRunner()),
       connect_instance_func_(NULL),
       local_pp_module_(base::RandInt(0, std::numeric_limits<PP_Module>::max())),
       next_plugin_dispatcher_id_(1) {
   plugin_globals_.SetPluginProxyDelegate(this);
@@ skipping 490 matching lines @@
           GetHistogramName(is_broker_, "LoadTime", path),
           base::TimeDelta::FromMilliseconds(1),
           base::TimeDelta::FromSeconds(10),
           50,
           base::HistogramBase::kUmaTargetedHistogramFlag);
 
   histogram->AddTime(load_time);
 }
 
 }  // namespace content