Adds WmLayoutManager and the aura wrapper AuraLayoutManagerAdapter

No tests as ash_unittests is going to end up testing this by virtue
of converting some of the ash LayoutManagers to be WmLayoutManagers
and installing on aura::Windows.

BUG=603369
TEST=none
R=jamescook@chromium.org

Review URL: https://codereview.chromium.org/1894593002

Cr-Commit-Position: refs/heads/master@{#387686}

ash/ash.gyp

@@ -523,6 +523,8 @@
       'wm/ash_focus_rules.h',
       'wm/ash_native_cursor_manager.cc',
       'wm/ash_native_cursor_manager.h',
+      'wm/aura/aura_layout_manager_adapter.cc',
+      'wm/aura/aura_layout_manager_adapter.h',
       'wm/aura/wm_root_window_controller_aura.cc',
       'wm/aura/wm_root_window_controller_aura.h',
       'wm/aura/wm_window_aura.cc',
@@ -531,6 +533,7 @@
       'wm/boot_splash_screen_chromeos.h',
       'wm/common/wm_event.cc',
       'wm/common/wm_event.h',
+      'wm/common/wm_layout_manager.h',
       'wm/common/wm_root_window_controller.h',
       'wm/common/wm_screen_util.cc',
       'wm/common/wm_screen_util.h',

ash/wm/aura/aura_layout_manager_adapter.cc

@@ -0,0 +1,51 @@
+// 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/wm/aura/aura_layout_manager_adapter.h"
+
+#include "ash/wm/aura/wm_window_aura.h"
+#include "ash/wm/common/wm_layout_manager.h"
+
+namespace ash {
+namespace wm {
+
+AuraLayoutManagerAdapter::AuraLayoutManagerAdapter(
+    std::unique_ptr<WmLayoutManager> wm_layout_manager)
+    : wm_layout_manager_(std::move(wm_layout_manager)) {}
+
+AuraLayoutManagerAdapter::~AuraLayoutManagerAdapter() {}
+
+void AuraLayoutManagerAdapter::OnWindowResized() {
+  wm_layout_manager_->OnWindowResized();
+}
+
+void AuraLayoutManagerAdapter::OnWindowAddedToLayout(aura::Window* child) {
+  wm_layout_manager_->OnWindowAddedToLayout(WmWindowAura::Get(child));
+}
+
+void AuraLayoutManagerAdapter::OnWillRemoveWindowFromLayout(
+    aura::Window* child) {
+  wm_layout_manager_->OnWillRemoveWindowFromLayout(WmWindowAura::Get(child));
+}
+
+void AuraLayoutManagerAdapter::OnWindowRemovedFromLayout(aura::Window* child) {
+  wm_layout_manager_->OnWindowRemovedFromLayout(WmWindowAura::Get(child));
+}
+
+void AuraLayoutManagerAdapter::OnChildWindowVisibilityChanged(
+    aura::Window* child,
+    bool visible) {
+  wm_layout_manager_->OnChildWindowVisibilityChanged(WmWindowAura::Get(child),
+                                                     visible);
+}
+
+void AuraLayoutManagerAdapter::SetChildBounds(
+    aura::Window* child,
+    const gfx::Rect& requested_bounds) {
+  wm_layout_manager_->SetChildBounds(WmWindowAura::Get(child),
+                                     requested_bounds);
+}
+
+}  // namespace wm
+}  // namespace ash

ash/wm/aura/aura_layout_manager_adapter.h

@@ -0,0 +1,47 @@
+// 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.
+
+#ifndef ASH_WM_AURA_AURA_LAYOUT_MANAGER_ADAPTER_H_
+#define ASH_WM_AURA_AURA_LAYOUT_MANAGER_ADAPTER_H_
+
+#include <memory>
+
+#include "ash/ash_export.h"
+#include "base/macros.h"
+#include "ui/aura/layout_manager.h"
+
+namespace ash {
+namespace wm {
+
+class WmLayoutManager;
+
+// AuraLayoutManagerAdapter is an aura::LayoutManager that calls to
+// WmLayoutManager. Use it when you have a WmLayoutManager you want to use
+// with an aura::Window.
+class ASH_EXPORT AuraLayoutManagerAdapter : public aura::LayoutManager {
+ public:
+  explicit AuraLayoutManagerAdapter(
+      std::unique_ptr<WmLayoutManager> wm_layout_manager);
+  ~AuraLayoutManagerAdapter() override;
+
+  // aura::LayoutManager:
+  void OnWindowResized() override;
+  void OnWindowAddedToLayout(aura::Window* child) override;
+  void OnWillRemoveWindowFromLayout(aura::Window* child) override;
+  void OnWindowRemovedFromLayout(aura::Window* child) override;
+  void OnChildWindowVisibilityChanged(aura::Window* child,
+                                      bool visible) override;
+  void SetChildBounds(aura::Window* child,
+                      const gfx::Rect& requested_bounds) override;
+
+ private:
+  std::unique_ptr<WmLayoutManager> wm_layout_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(AuraLayoutManagerAdapter);
+};
+
+}  // namespace wm
+}  // namespace ash
+
+#endif  // ASH_WM_AURA_AURA_LAYOUT_MANAGER_ADAPTER_H_

ash/wm/common/wm_layout_manager.h

@@ -0,0 +1,57 @@
+// 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.
+
+#ifndef ASH_WM_COMMON_WM_LAYOUT_MANAGER_H_
+#define ASH_WM_COMMON_WM_LAYOUT_MANAGER_H_
+
+#include "ash/ash_export.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace ash {
+namespace wm {
+
+class WmWindow;
+
+// Used to position the child WmWindows of a WmWindow. WmLayoutManager is called
+// at key points in a WmWindows life cycle thats allow sthe WmLayoutManager to
+// position or change child WmWindows.
+class ASH_EXPORT WmLayoutManager {
+ public:
+  virtual ~WmLayoutManager() {}
+
+  // Invoked when the window the WmLayoutManager is associated with is resized.
+  virtual void OnWindowResized() = 0;
+
+  // Invoked when a window is added to the window the WmLayoutManager is
+  // associated with.
+  virtual void OnWindowAddedToLayout(WmWindow* child) = 0;
+
+  // Invoked prior to removing |child|.
+  virtual void OnWillRemoveWindowFromLayout(WmWindow* child) = 0;
+
+  // Invoked after removing |child|.
+  virtual void OnWindowRemovedFromLayout(WmWindow* child) = 0;
+
+  // Invoked when SetVisible() is invoked on |child|. |visible| is the value
+  // supplied to SetVisible(). If |visible| is true, child->IsVisible() may
+  // still return false. See description in aura::Window::IsVisible() for
+  // details.
+  virtual void OnChildWindowVisibilityChanged(WmWindow* child,
+                                              bool visibile) = 0;
+
+  // Invoked when WmWindow::SetBounds() is called on |child|. This allows the
+  // WmLayoutManager to modify the bounds as appropriate before processing the
+  // request, including ignoring the request. Implementation must call
+  // SetChildBoundsDirect() so that an infinite loop does not result.
+  virtual void SetChildBounds(WmWindow* child,
+                              const gfx::Rect& requested_bounds) = 0;
+};
+
+}  // namespace wm
+}  // namespace ash
+
+#endif  // ASH_WM_COMMON_WM_LAYOUT_MANAGER_H_