Convert KeyboardDrivenEventRewriter to a ui::EventRewriter.

chrome/browser/chromeos/events/event_rewriter_controller.cc

+// Copyright 2014 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 "chrome/browser/chromeos/events/event_rewriter_controller.h"
+
+#include "ash/shell.h"
+#include "ui/aura/window_tree_host.h"
+#include "ui/events/event_source.h"
+
+namespace chromeos {
+
+EventRewriterController::EventRewriterController(ui::EventRewriter* rewriter)
+    : rewriter_(rewriter) {
+}
+
+EventRewriterController::~EventRewriterController() {
+}
+
+void EventRewriterController::Init() {
+  // Add the rewriter to each existing root window EventSource.
+  aura::Window::Windows windows = ash::Shell::GetAllRootWindows();
+  for (aura::Window::Windows::iterator i = windows.begin(), e = windows.end();

[Daniel Erat, 2014/04/18 02:50:06]

nit: i haven't seen this style used in chromium before. something like this is
more common:

  for (...::iterator it = windows.begin();
       it != windows.end(); ++it)

i.e. no need to pre-cache the end iterator, and 'i' is usually just used for int
iterators, with 'it' or 'iter' used for stl iterators

+       i != e;
+       ++i) {
+    AddToEventSource((*i)->GetHost()->GetEventSource());

[Daniel Erat, 2014/04/18 02:50:06]

do you need to unregister it later?

+  }
+}
+
+void EventRewriterController::OnHostInitialized(aura::WindowTreeHost* host) {
+  AddToEventSource(host->GetEventSource());
+}
+
+void EventRewriterController::AddToEventSource(ui::EventSource* source) {
+  DCHECK(source);
+  event_sources_.push_back(source);
+  source->AddEventRewriter(rewriter_.get());

[Daniel Erat, 2014/04/18 02:50:06]

do you need to unregister it later?

+}
+
+}  // namespace chromeos