Added directwrite warmup for PPAPI processes.

content/browser/ppapi_plugin_process_host.cc

Index: content/browser/ppapi_plugin_process_host.cc
diff --git a/content/browser/ppapi_plugin_process_host.cc b/content/browser/ppapi_plugin_process_host.cc
index 3dd06594bbe1f06a1058c4d81f114f2f87d301fb..794a5a108034f13d46a3dc8d49a14f746891e62d 100644
--- a/content/browser/ppapi_plugin_process_host.cc
+++ b/content/browser/ppapi_plugin_process_host.cc
@@ -10,6 +10,7 @@
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/metrics/field_trial.h"
+#include "base/strings/string_number_conversions.h"

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

You don't use this.

[forshaw, 2015/09/16 12:46:57]

Used for DoubleToString below.

 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/browser_child_process_host_impl.h"
 #include "content/browser/plugin_service_impl.h"
@@ -33,6 +34,7 @@
 #include "content/common/sandbox_win.h"
 #include "sandbox/win/src/process_mitigations.h"
 #include "sandbox/win/src/sandbox_policy.h"
+#include "ui/gfx/win/dpi.h"
 #endif
 
 namespace content {
@@ -396,6 +398,11 @@ bool PpapiPluginProcessHost::Init(const PepperPluginInfo& info) {
     cmd_line->AppendSwitchASCII(switches::kLang, locale);
   }
 
+#if defined(OS_WIN)
+  cmd_line->AppendSwitchASCII(switches::kDeviceScaleFactor,
+                              base::DoubleToString(gfx::GetDPIScale()));
+#endif
+
   if (!plugin_launcher.empty())
     cmd_line->PrependWrapper(plugin_launcher);