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() : initialized_(false) {

[sadrul, 2014/04/23 19:32:53]

Initialize operational_

+}
+
+EventRewriterController::~EventRewriterController() {
+  Shutdown();
+}
+
+void EventRewriterController::AddEventRewriter(
+    scoped_ptr<ui::EventRewriter> rewriter) {
+  DCHECK(!initialized_);
+  rewriters_.push_back(rewriter.release());
+}
+
+void EventRewriterController::Init() {
+  DCHECK(!initialized_);
+  initialized_ = true;
+  // Add the rewriters to each existing root window EventSource.
+  aura::Window::Windows windows = ash::Shell::GetAllRootWindows();
+  for (aura::Window::Windows::iterator it = windows.begin();
+       it != windows.end();
+       ++it) {
+    AddToEventSource((*it)->GetHost()->GetEventSource());
+  }
+  operational_ = true;
+}
+
+void EventRewriterController::Shutdown() {
+  operational_ = false;

[sadrul, 2014/04/23 19:32:53]

It's unclear to me why we need both operational_ and initialized_. Can we use
just one?

[kpschoedel, 2014/04/23 21:33:15]

I'll change to one. I had separate states to enforce that you can't add more
rewriters and/or re-initialize after shutdown, but that's probably overkill.

+  // Remove the rewriters from every root window EventSource and destroy them.
+  for (EventRewriters::iterator rewriter_iter = rewriters_.begin();
+       rewriter_iter != rewriters_.end();
+       ++rewriter_iter) {
+    aura::Window::Windows windows = ash::Shell::GetAllRootWindows();
+    for (aura::Window::Windows::iterator window_iter = windows.begin();
+         window_iter != windows.end();
+         ++window_iter) {
+      (*window_iter)->GetHost()->GetEventSource()->RemoveEventRewriter(
+          *rewriter_iter);
+    }
+  }
+  rewriters_.clear();
+}
+
+void EventRewriterController::OnHostInitialized(aura::WindowTreeHost* host) {
+  if (operational_)
+    AddToEventSource(host->GetEventSource());
+}
+
+void EventRewriterController::AddToEventSource(ui::EventSource* source) {
+  DCHECK(source);
+  for (EventRewriters::iterator it = rewriters_.begin(); it != rewriters_.end();
+       ++it) {
+    source->AddEventRewriter(*it);
+  }
+}
+
+}  // namespace chromeos