cros: Bind password echo with TouchView mode

chrome/browser/chromeos/ui/password_echo_controller.cc

+// Copyright 2016 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/ui/password_echo_controller.h"
+
+#include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
+#include "ash/common/wm_shell.h"
+#include "base/logging.h"
+#include "base/time/time.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/render_widget_host.h"
+#include "content/public/browser/render_widget_host_iterator.h"
+#include "ui/views/views_delegate.h"
+
+namespace chromeos {
+
+namespace {
+
+PasswordEchoController* instance = nullptr;
+
+}  // namespace
+
+// static
+PasswordEchoController* PasswordEchoController::Get() {
+  return instance;
+}
+
+PasswordEchoController::PasswordEchoController() {
+  DCHECK(!instance);
+  instance = this;
+
+  ash::WmShell::Get()->AddShellObserver(this);
+  SetEnabled(ash::WmShell::Get()
+                 ->maximize_mode_controller()
+                 ->IsMaximizeModeWindowManagerEnabled());
+}
+
+PasswordEchoController::~PasswordEchoController() {
+  DCHECK_EQ(this, instance);
+  instance = nullptr;
+  ash::WmShell::Get()->RemoveShellObserver(this);
+}
+
+void PasswordEchoController::SetEnabled(bool enabled) {
+  if (enabled_ == enabled)
+    return;
+
+  enabled_ = enabled;
+
+  UpdateWebkitPreferences();
+  // Textfield gets the state via ChromeViewsDelegate which will query the
+  // state set here. So nothing needs to done here.
+}
+
+void PasswordEchoController::UpdateWebkitPreferences() {
+  std::unique_ptr<content::RenderWidgetHostIterator> widgets(
+      content::RenderWidgetHost::GetRenderWidgetHosts());
+  while (content::RenderWidgetHost* widget = widgets->GetNextHost()) {
+    content::RenderViewHost* rvh = content::RenderViewHost::From(widget);
+    if (!rvh)
+      continue;
+
+    rvh->OnWebkitPreferencesChanged();
+  }
+}
+
+void PasswordEchoController::OnMaximizeModeStarted() {
+  SetEnabled(true);
+}
+
+void PasswordEchoController::OnMaximizeModeEnded() {
+  SetEnabled(false);
+}
+
+}  // namespace chromeos