Introduce ViewRoot to forward input/view events to native

ui/android/BUILD.gn

 # 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.
 
 import("//build/config/android/rules.gni")
 import("//testing/test.gni")
 
 assert(is_android)
 
 component("android") {
   output_name = "ui_android"
   sources = [
     "animation_utils.h",
     "context_provider_factory.cc",
     "context_provider_factory.h",
     "delegated_frame_host_android.cc",
     "delegated_frame_host_android.h",
     "display_android_manager.cc",
     "display_android_manager.h",
     "edge_effect.cc",
     "edge_effect.h",
     "edge_effect_base.cc",
     "edge_effect_base.h",
     "edge_effect_l.cc",
     "edge_effect_l.h",
+    "event_handler.cc",
+    "event_handler.h",
     "overscroll_glow.cc",
     "overscroll_glow.h",
     "overscroll_refresh.cc",
     "overscroll_refresh.h",
     "resources/crushed_sprite_resource.cc",
     "resources/crushed_sprite_resource.h",
     "resources/resource_manager.cc",
     "resources/resource_manager.h",
     "resources/resource_manager_impl.cc",
     "resources/resource_manager_impl.h",
@@ skipping 33 matching lines @@
   ]
 
   deps = [
     "//ui/android",
     "//ui/display",
   ]
 }
 
 generate_jni("ui_android_jni_headers") {
   sources = [
+    "java/src/org/chromium/ui/base/EventHandler.java",
     "java/src/org/chromium/ui/base/ViewAndroidDelegate.java",
     "java/src/org/chromium/ui/base/WindowAndroid.java",
     "java/src/org/chromium/ui/display/DisplayAndroidManager.java",
     "java/src/org/chromium/ui/resources/ResourceManager.java",
   ]
   jni_package = "ui_android"
 }
 
 java_cpp_enum("java_enums_srcjar") {
   sources = [
@@ skipping 70 matching lines @@
     "java/src/org/chromium/ui/DropdownDividerDrawable.java",
     "java/src/org/chromium/ui/DropdownItem.java",
     "java/src/org/chromium/ui/DropdownItemBase.java",
     "java/src/org/chromium/ui/DropdownPopupWindow.java",
     "java/src/org/chromium/ui/UiUtils.java",
     "java/src/org/chromium/ui/VSyncMonitor.java",
     "java/src/org/chromium/ui/base/ActivityWindowAndroid.java",
     "java/src/org/chromium/ui/base/AndroidPermissionDelegate.java",
     "java/src/org/chromium/ui/base/Clipboard.java",
     "java/src/org/chromium/ui/base/DeviceFormFactor.java",
+    "java/src/org/chromium/ui/base/EventHandler.java",
     "java/src/org/chromium/ui/base/LocalizationUtils.java",
     "java/src/org/chromium/ui/base/ResourceBundle.java",
     "java/src/org/chromium/ui/base/SelectFileDialog.java",
     "java/src/org/chromium/ui/base/TouchDevice.java",
     "java/src/org/chromium/ui/base/ViewAndroidDelegate.java",
     "java/src/org/chromium/ui/base/WindowAndroid.java",
     "java/src/org/chromium/ui/display/DisplayAndroid.java",
     "java/src/org/chromium/ui/display/DisplayAndroidManager.java",
     "java/src/org/chromium/ui/display/DisplaySwitches.java",
     "java/src/org/chromium/ui/display/PhysicalDisplayAndroid.java",
@@ skipping 68 matching lines @@
     "//cc",
     "//cc:test_support",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//ui/gfx",
     "//ui/resources:ui_test_pak",
   ]
 }