Hook up Chrome's wallpaper picker for mash.

ash/mus/user_wallpaper_delegate_mus.cc

Index: ash/mus/user_wallpaper_delegate_mus.cc
diff --git a/ash/mus/user_wallpaper_delegate_mus.cc b/ash/mus/user_wallpaper_delegate_mus.cc
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index 0000000000000000000000000000000000000000..69b2a1de02a60499f14345f7f0b5359a553b318a
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+++ b/ash/mus/user_wallpaper_delegate_mus.cc
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+// Copyright 2016 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 "ash/mus/user_wallpaper_delegate_mus.h"
+
+#include "ash/desktop_background/desktop_background_controller.h"
+#include "ash/shell.h"
+#include "components/wallpaper/wallpaper_layout.h"
+#include "mash/public/interfaces/wallpaper.mojom.h"
+#include "services/shell/public/cpp/connector.h"
+#include "skia/public/type_converters.h"
+#include "ui/views/mus/window_manager_connection.h"
+#include "ui/wm/core/window_animations.h"
+
+namespace ash {
+
+int UserWallpaperDelegateMus::GetAnimationType() {
+  return ::wm::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE;
+}
+
+int UserWallpaperDelegateMus::GetAnimationDurationOverride() {
+  return 0;
+}
+
+void UserWallpaperDelegateMus::SetAnimationDurationOverride(
+    int animation_duration_in_ms) {
+  NOTIMPLEMENTED();
+}
+
+bool UserWallpaperDelegateMus::ShouldShowInitialAnimation() {
+  return false;
+}
+
+void UserWallpaperDelegateMus::UpdateWallpaper(bool clear_cache) {
+  NOTIMPLEMENTED();
+}
+
+void UserWallpaperDelegateMus::InitializeWallpaper() {
+  // No action required; ChromeBrowserMainPartsChromeos inits WallpaperManager.
+}
+
+void UserWallpaperDelegateMus::OpenSetWallpaperPage() {
+  mash::mojom::WallpaperHelperPtr wallpaper_helper;
+  auto* connector = views::WindowManagerConnection::Get()->connector();
+  connector->ConnectToInterface("exe:chrome", &wallpaper_helper);
+  wallpaper_helper->OpenWallpaperManager();
+}
+
+bool UserWallpaperDelegateMus::CanOpenSetWallpaperPage() {
+  return true;

[James Cook, 2016/05/19 22:29:59]

Maybe a TODO here about login status?

[msw, 2016/05/20 19:53:05]

Done.

+}
+
+void UserWallpaperDelegateMus::OnWallpaperAnimationFinished() {}
+
+void UserWallpaperDelegateMus::OnWallpaperBootAnimationFinished() {}
+
+void UserWallpaperDelegateMus::SetWallpaper(skia::mojom::BitmapPtr wallpaper,
+                                            int32_t layout) {
+  const SkBitmap bitmap = wallpaper.To<SkBitmap>();
+  if (bitmap.isNull())
+    return;
+  gfx::ImageSkia image = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
+  ash::Shell::GetInstance()->desktop_background_controller()->SetWallpaperImage(
+      image, static_cast<wallpaper::WallpaperLayout>(layout));
+}
+
+}  // namespace ash