Created fakes for HID-detection screen testing. Initial browsertest added.

chrome/browser/chromeos/device/input_service_proxy.h

Index: chrome/browser/chromeos/device/input_service_proxy.h
diff --git a/chrome/browser/chromeos/device/input_service_proxy.h b/chrome/browser/chromeos/device/input_service_proxy.h
index e41196f62ca05046a4dda634f82ab0fc329dce87..44a0a6300266b235e10498e9d0285f568b920cda 100644
--- a/chrome/browser/chromeos/device/input_service_proxy.h
+++ b/chrome/browser/chromeos/device/input_service_proxy.h
@@ -11,7 +11,9 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "base/task_runner.h"
 #include "base/threading/thread_checker.h"
+#include "content/public/browser/browser_thread.h"
 #include "device/hid/input_service_linux.h"
 
 namespace chromeos {
@@ -47,7 +49,12 @@ class InputServiceProxy {
   void GetDeviceInfo(const std::string& id,
                      const GetDeviceInfoCallback& callback);
 
+  // Should be called once before any InputServiceProxy instance is created.
+  static void SetThreadIdForTesting(content::BrowserThread::ID thread_id);
+
  private:
+  static content::BrowserThread::ID thread_identifier_;
+
   class ServiceObserver;
 
   void OnDeviceAdded(const device::InputServiceLinux::InputDeviceInfo& info);
@@ -58,6 +65,8 @@ class InputServiceProxy {
 
   base::ThreadChecker thread_checker_;
 
+  scoped_refptr<base::TaskRunner> task_runner_;
+
   base::WeakPtrFactory<InputServiceProxy> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InputServiceProxy);