Reland of Android: support multiple displays on C++ side

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",
     "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",
     "resources/ui_resource_provider.h",
+    "screen_android.h",
     "ui_android_export.h",
     "ui_android_jni_registrar.cc",
     "ui_android_jni_registrar.h",
     "view_android.cc",
     "view_android.h",
     "window_android.cc",
     "window_android.h",
     "window_android_compositor.h",
     "window_android_observer.h",
   ]
 
   defines = [ "UI_ANDROID_IMPLEMENTATION" ]
 
   deps = [
     ":java_enums_srcjar",
     ":ui_android_jni_headers",
     "//base",
     "//cc",
     "//cc/surfaces",
     "//skia",
     "//ui/display",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }
 
+static_library("test_support") {
+  testonly = true
+  sources = [
+    "dummy_screen_android.cc",
+    "dummy_screen_android.h",
+  ]
+
+  deps = [
+    "//ui/android",
+    "//ui/display",
+  ]
+}
+
 generate_jni("ui_android_jni_headers") {
   sources = [
     "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 = [
     "../base/ime/text_input_type.h",
     "../base/page_transition_types.h",
     "../base/touch/touch_device.h",
@@ skipping 153 matching lines @@
     "//cc",
     "//cc:test_support",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//ui/gfx",
     "//ui/resources:ui_test_pak",
   ]
 }