[Chromecast] Add input support.

ui/ozone/platform/cast/platform_window_cast.h

Index: ui/ozone/platform/cast/platform_window_cast.h
diff --git a/ui/ozone/platform/cast/platform_window_cast.h b/ui/ozone/platform/cast/platform_window_cast.h
index 7e5f83cece6d15486a5beb9f7eb2e9e08295ce60..758e79a5c1d97b3a5ef7bc22dbe575780599718f 100644
--- a/ui/ozone/platform/cast/platform_window_cast.h
+++ b/ui/ozone/platform/cast/platform_window_cast.h
@@ -6,6 +6,7 @@
 #define UI_OZONE_PLATFORM_CAST_PLATFORM_WINDOW_CAST_H_
 
 #include "base/macros.h"
+#include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/platform_window/platform_window.h"
@@ -14,10 +15,11 @@ namespace ui {
 
 class PlatformWindowDelegate;
 
-class PlatformWindowCast : public PlatformWindow {
+class PlatformWindowCast : public PlatformWindow,
+                           public PlatformEventDispatcher {
  public:
   PlatformWindowCast(PlatformWindowDelegate* delegate, const gfx::Rect& bounds);
-  ~PlatformWindowCast() override {}
+  ~PlatformWindowCast() override;
 
   // PlatformWindow implementation:
   gfx::Rect GetBounds() override;
@@ -37,6 +39,10 @@ class PlatformWindowCast : public PlatformWindow {
   void ConfineCursorToBounds(const gfx::Rect& bounds) override {}
   PlatformImeController* GetPlatformImeController() override;
 
+  // PlatformEventDispatcher implementation:
+  bool CanDispatchEvent(const PlatformEvent& event) override;
+  uint32_t DispatchEvent(const PlatformEvent& event) override;
+
  private:
   PlatformWindowDelegate* delegate_;
   gfx::Rect bounds_;