Introduce ViewRoot forwarding input/view events to native

ui/android/display_android_manager.cc

Index: ui/android/display_android_manager.cc
diff --git a/ui/android/display_android_manager.cc b/ui/android/display_android_manager.cc
index 50e5552f3b98e3db54ffb058197d496c51b3e216..11fb9764739ad2473c9164c9fa5062d5c95f5edf 100644
--- a/ui/android/display_android_manager.cc
+++ b/ui/android/display_android_manager.cc
@@ -11,6 +11,7 @@
 #include "base/stl_util.h"
 #include "jni/DisplayAndroidManager_jni.h"
 #include "ui/android/screen_android.h"
+#include "ui/android/view_android.h"
 #include "ui/android/window_android.h"
 #include "ui/display/display.h"
 
@@ -39,11 +40,13 @@ DisplayAndroidManager::DisplayAndroidManager() {}
 
 DisplayAndroidManager::~DisplayAndroidManager() {}
 
-// Screen interface.
+// static
+DisplayAndroidManager* DisplayAndroidManager::GetInstance() {
+  return static_cast<DisplayAndroidManager*>(display::Screen::GetScreen());
+}
 
-Display DisplayAndroidManager::GetDisplayNearestWindow(
-    gfx::NativeView view) const {
-  ui::WindowAndroid* window = view ? view->GetWindowAndroid() : nullptr;
+Display DisplayAndroidManager::GetDisplayNearestWindowAndroid(
+      gfx::NativeWindow window) const {
   if (window) {
     DisplayList::Displays::const_iterator it =
         display_list().FindDisplayById(window->display_id());
@@ -54,6 +57,14 @@ Display DisplayAndroidManager::GetDisplayNearestWindow(
   return GetPrimaryDisplay();
 }
 
+// Screen interface.
+
+Display DisplayAndroidManager::GetDisplayNearestWindow(
+    gfx::NativeView view) const {
+  ui::WindowAndroid* window = view ? view->GetWindowAndroid() : nullptr;
+  return GetDisplayNearestWindowAndroid(window);
+}
+
 // There is no notion of relative display positions on Android.
 Display DisplayAndroidManager::GetDisplayNearestPoint(
     const gfx::Point& point) const {