[Chromecast] Add input support.

ui/ozone/platform/cast/platform_window_cast.cc

 // Copyright 2015 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 "ui/ozone/platform/cast/platform_window_cast.h"
 
+#include "base/bind.h"
+#include "ui/events/event.h"
+#include "ui/events/ozone/events_ozone.h"
+#include "ui/events/platform/platform_event_source.h"
 #include "ui/platform_window/platform_window_delegate.h"
 
 namespace ui {
 
 PlatformWindowCast::PlatformWindowCast(PlatformWindowDelegate* delegate,
                                        const gfx::Rect& bounds)
     : delegate_(delegate), bounds_(bounds) {
   widget_ = (bounds.width() << 16) + bounds.height();
   delegate_->OnAcceleratedWidgetAvailable(widget_, 1.f);
+
+  if (ui::PlatformEventSource::GetInstance()) {
+    ui::PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
+  }
+}
+
+PlatformWindowCast::~PlatformWindowCast() {
+  if (ui::PlatformEventSource::GetInstance()) {
+    ui::PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
+  }
 }
 
 gfx::Rect PlatformWindowCast::GetBounds() {
   return bounds_;
 }
 
 void PlatformWindowCast::SetBounds(const gfx::Rect& bounds) {
   bounds_ = bounds;
   delegate_->OnBoundsChanged(bounds);
 }
 
 void PlatformWindowCast::SetTitle(const base::string16& title) {
 }
 
 PlatformImeController* PlatformWindowCast::GetPlatformImeController() {
   return nullptr;
 }
 
+bool PlatformWindowCast::CanDispatchEvent(const ui::PlatformEvent& ne) {
+  return true;
+}
+
+uint32_t PlatformWindowCast::DispatchEvent(
+    const ui::PlatformEvent& native_event) {
+  DispatchEventFromNativeUiEvent(
+      native_event, base::Bind(&PlatformWindowDelegate::DispatchEvent,
+                               base::Unretained(delegate_)));
+
+  return ui::POST_DISPATCH_STOP_PROPAGATION;
+}
+
 }  // namespace ui