Introduce SnapControllerLacros

Implementation is stubbed out today, but still needed so that
BrowserNonClientFrameViewChromeOS can be adopted on lacros builds.

SnapControllerLacros inherits the pure virtual
chromeos::SnapController, and "maximizing" lacros chrome windows
require an instance to exist (held by ChromeBrowserMainExtraPartsViewsLacros).

Similarly to ash::SnapControllerImpl, SnapControllerLacros
is created from the newly added
ChromeBrowserMainExtraPartsViewsLacros::PreProfileInit().

BUG=1113900
R=jamescook@chromium.org

Change-Id: I86a034ddcba7c12c3a7d7b2736058476c2db3ba2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547045
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828976}

chrome/browser/BUILD.gn

@@ -4517,6 +4517,8 @@ static_library("browser") {
       "lacros/immersive_context_lacros.h",
       "lacros/lacros_chrome_service_delegate_impl.cc",
       "lacros/lacros_chrome_service_delegate_impl.h",
+      "lacros/snap_controller_lacros.cc",
+      "lacros/snap_controller_lacros.h",
       "lacros/system_logs/lacros_system_log_fetcher.cc",
       "lacros/system_logs/lacros_system_log_fetcher.h",
       "metrics/enrollment_status.h",

chrome/browser/lacros/snap_controller_lacros.cc

+// Copyright 2020 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 "chrome/browser/lacros/snap_controller_lacros.h"
+
+#include "base/notreached.h"
+
+SnapControllerLacros::SnapControllerLacros() = default;
+SnapControllerLacros::~SnapControllerLacros() = default;
+
+bool SnapControllerLacros::CanSnap(aura::Window* window) {
+  NOTIMPLEMENTED();
+  return false;
+}
+void SnapControllerLacros::ShowSnapPreview(aura::Window* window,
+                                           chromeos::SnapDirection snap) {
+  NOTIMPLEMENTED();
+}
+void SnapControllerLacros::CommitSnap(aura::Window* window,
+                                      chromeos::SnapDirection snap) {
+  NOTIMPLEMENTED();
+}

chrome/browser/lacros/snap_controller_lacros.h

+// Copyright 2020 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.
+
+#ifndef CHROME_BROWSER_LACROS_SNAP_CONTROLLER_LACROS_H_
+#define CHROME_BROWSER_LACROS_SNAP_CONTROLLER_LACROS_H_
+
+#include "chromeos/ui/frame/caption_buttons/snap_controller.h"
+
+// Stub Lacros implementation of chromeos::SnapController.
+class SnapControllerLacros : public chromeos::SnapController {
+ public:
+  SnapControllerLacros();
+  SnapControllerLacros(const SnapControllerLacros&) = delete;
+  SnapControllerLacros& operator=(const SnapControllerLacros&) = delete;
+  ~SnapControllerLacros() override;
+
+  // chromeos::SnapController:
+  bool CanSnap(aura::Window* window) override;
+  void ShowSnapPreview(aura::Window* window,
+                       chromeos::SnapDirection snap) override;
+  void CommitSnap(aura::Window* window, chromeos::SnapDirection snap) override;
+};
+
+#endif  // CHROME_BROWSER_LACROS_SNAP_CONTROLLER_LACROS_H_

chrome/browser/ui/views/chrome_browser_main_extra_parts_views_lacros.cc

@@ -5,6 +5,7 @@
 #include "chrome/browser/ui/views/chrome_browser_main_extra_parts_views_lacros.h"
 
 #include "chrome/browser/lacros/immersive_context_lacros.h"
+#include "chrome/browser/lacros/snap_controller_lacros.h"
 #include "chromeos/ui/base/tablet_state.h"
 
 ChromeBrowserMainExtraPartsViewsLacros::
@@ -15,6 +16,7 @@ ChromeBrowserMainExtraPartsViewsLacros::
 
 void ChromeBrowserMainExtraPartsViewsLacros::PreProfileInit() {
   immersive_context_ = std::make_unique<ImmersiveContextLacros>();
+  snap_controller_ = std::make_unique<SnapControllerLacros>();
   tablet_state_ = std::make_unique<chromeos::TabletState>();
 
   ChromeBrowserMainExtraPartsViews::PreProfileInit();

chrome/browser/ui/views/chrome_browser_main_extra_parts_views_lacros.h

@@ -14,6 +14,7 @@ class TabletState;
 }
 
 class ImmersiveContextLacros;
+class SnapControllerLacros;
 
 class ChromeBrowserMainExtraPartsViewsLacros
     : public ChromeBrowserMainExtraPartsViews {
@@ -30,6 +31,7 @@ class ChromeBrowserMainExtraPartsViewsLacros
   void PreProfileInit() override;
 
   std::unique_ptr<ImmersiveContextLacros> immersive_context_;
+  std::unique_ptr<SnapControllerLacros> snap_controller_;
   std::unique_ptr<chromeos::TabletState> tablet_state_;
 };