Adding key press detection in the browser process.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 1c6b1a033ebb75395447ad15d59d8b2dd3c35984..2f29698484684292593e3cbc353d8230b14303c3 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -49,6 +49,7 @@
 #include "content/public/common/result_codes.h"
 #include "crypto/nss_util.h"
 #include "media/audio/audio_manager.h"
+#include "media/audio/key_press_monitor.h"
 #include "media/base/media.h"
 #include "media/midi/midi_manager.h"
 #include "net/base/network_change_notifier.h"
@@ -864,6 +865,15 @@ int BrowserMainLoop::BrowserThreadsStarted() {
         audio_manager_.get(), media_stream_manager_.get()));
   }
 
+  {
+    TRACE_EVENT0("startup",
+                 "BrowserMainLoop::BrowserThreadsStarted::InitKeyPressMonitor");
+    key_press_monitor_.reset(
+        new media::KeyPressMonitor(audio_manager_->GetMessageLoop(),
+                                   io_thread_->message_loop_proxy(),
+                                   main_thread_->message_loop_proxy()));
+  }
+
   // Alert the clipboard class to which threads are allowed to access the
   // clipboard:
   std::vector<base::PlatformThreadId> allowed_clipboard_threads;