athena: Remove ActivityViewModel::CreateWidget().

Use the existing views API (views::Widget::GetWidgetForNativeView()) to
get any existing views::Widget for an athena::Activity, instead of asking
its ActivityViewModel.

BUG=none
R=oshima@chromium.org

Review URL: https://codereview.chromium.org/702473005

Cr-Commit-Position: refs/heads/master@{#302523}

athena/activity/activity_manager_impl.cc

@@ -21,13 +21,15 @@ namespace {
 ActivityManager* instance = nullptr;
 
 views::Widget* CreateWidget(Activity* activity) {
-  ActivityViewModel* view_model = activity->GetActivityViewModel();
-  views::Widget* widget = view_model->CreateWidget();
+  aura::Window* window = activity->GetWindow();
+  views::Widget* widget =
+      window ? views::Widget::GetWidgetForNativeView(window) : nullptr;
   if (widget)
     return widget;
   widget = new views::Widget;
   views::Widget::InitParams params(views::Widget::InitParams::TYPE_WINDOW);
-  params.delegate = new ActivityWidgetDelegate(view_model);
+  params.delegate =
+      new ActivityWidgetDelegate(activity->GetActivityViewModel());
   widget->Init(params);
   activity->GetActivityViewModel()->Init();
   return widget;

athena/activity/public/activity_view_model.h

@@ -50,10 +50,6 @@ class ATHENA_EXPORT ActivityViewModel {
   // be deleted by the resource manager.
   virtual views::View* GetContentsView() = 0;
 
-  // Creates a custom widget for the activity. Returns nullptr to use default
-  // implementation.
-  virtual views::Widget* CreateWidget() = 0;
-
   // Returns an image which can be used to represent the activity in e.g. the
   // overview mode. The returned image can have no size if either a view exists
   // or the activity has not yet been loaded or ever been presented. In that

athena/content/app_activity.cc

@@ -93,7 +93,9 @@ Activity::ActivityMediaState AppActivity::GetMediaState() {
 }
 
 aura::Window* AppActivity::GetWindow() {
-  return !web_view_ ? nullptr : web_view_->GetWidget()->GetNativeWindow();
+  return web_view_ && web_view_->GetWidget()
+             ? web_view_->GetWidget()->GetNativeWindow()
+             : nullptr;
 }
 
 content::WebContents* AppActivity::GetWebContents() {
@@ -101,6 +103,10 @@ content::WebContents* AppActivity::GetWebContents() {
 }
 
 void AppActivity::Init() {
+  // Before we remove the proxy, we have to register the activity and
+  // initialize its to move it to the proper activity list location.
+  RegisterActivity();
+
   DCHECK(app_activity_registry_);
   Activity* app_proxy = app_activity_registry_->unloaded_activity_proxy();
   if (app_proxy) {
@@ -135,6 +141,16 @@ void AppActivity::Init() {
     // The proxy should now be deleted.
     DCHECK(!app_activity_registry_->unloaded_activity_proxy());
   }
+
+  // Make sure the content gets properly shown.
+  if (current_state_ == ACTIVITY_VISIBLE) {
+    HideContentProxy();
+  } else if (current_state_ == ACTIVITY_INVISIBLE) {
+    ShowContentProxy();
+  } else {
+    // If not previously specified, we change the state now to invisible..
+    SetCurrentState(ACTIVITY_INVISIBLE);
+  }
 }
 
 SkColor AppActivity::GetRepresentativeColor() const {
@@ -154,23 +170,6 @@ bool AppActivity::UsesFrame() const {
   return false;
 }
 
-views::Widget* AppActivity::CreateWidget() {
-  // Before we remove the proxy, we have to register the activity and
-  // initialize its to move it to the proper activity list location.
-  RegisterActivity();
-  Init();
-  // Make sure the content gets properly shown.
-  if (current_state_ == ACTIVITY_VISIBLE) {
-    HideContentProxy();
-  } else if (current_state_ == ACTIVITY_INVISIBLE) {
-    ShowContentProxy();
-  } else {
-    // If not previously specified, we change the state now to invisible..
-    SetCurrentState(ACTIVITY_INVISIBLE);
-  }
-  return web_view_->GetWidget();
-}
-
 views::View* AppActivity::GetContentsView() {
   return web_view_;
 }

athena/content/app_activity.h

@@ -45,7 +45,6 @@ class AppActivity : public Activity,
   base::string16 GetTitle() const override;
   gfx::ImageSkia GetIcon() const override;
   bool UsesFrame() const override;
-  views::Widget* CreateWidget() override;
   views::View* GetContentsView() override;
   gfx::ImageSkia GetOverviewModeImage() override;
   void PrepareContentsForOverview() override;

athena/content/app_activity_proxy.cc

@@ -52,7 +52,7 @@ Activity::ActivityMediaState AppActivityProxy::GetMediaState() {
 }
 
 aura::Window* AppActivityProxy::GetWindow() {
-  return view_->GetWidget()->GetNativeWindow();
+  return view_->GetWidget() ? view_->GetWidget()->GetNativeWindow() : nullptr;
 }
 
 content::WebContents* AppActivityProxy::GetWebContents() {
@@ -92,10 +92,6 @@ views::View* AppActivityProxy::GetContentsView() {
   return view_;
 }
 
-views::Widget* AppActivityProxy::CreateWidget() {
-  return nullptr;
-}
-
 gfx::ImageSkia AppActivityProxy::GetOverviewModeImage() {
   return content_proxy_->GetContentImage();
 }

athena/content/app_activity_proxy.h

@@ -45,7 +45,6 @@ class AppActivityProxy : public Activity,
   gfx::ImageSkia GetIcon() const override;
   bool UsesFrame() const override;
   views::View* GetContentsView() override;
-  views::Widget* CreateWidget() override;
   gfx::ImageSkia GetOverviewModeImage() override;
   void PrepareContentsForOverview() override;
   void ResetContentsView() override;

athena/content/app_activity_unittest.cc

@@ -61,7 +61,7 @@ class TestAppActivity : public AppActivity {
     return Activity::ACTIVITY_MEDIA_STATE_NONE;
   }
   aura::Window* GetWindow() override {
-    return view_->GetWidget()->GetNativeWindow();
+    return view_->GetWidget() ? view_->GetWidget()->GetNativeWindow() : nullptr;
   }
 
   // ActivityViewModel:
@@ -70,7 +70,6 @@ class TestAppActivity : public AppActivity {
   base::string16 GetTitle() const override { return title_; }
   bool UsesFrame() const override { return true; }
   views::View* GetContentsView() override { return view_; }
-  views::Widget* CreateWidget() override { return nullptr; }
   gfx::ImageSkia GetOverviewModeImage() override { return gfx::ImageSkia(); }
 
  private:

athena/content/web_activity.cc

@@ -528,7 +528,8 @@ Activity::ActivityMediaState WebActivity::GetMediaState() {
 }
 
 aura::Window* WebActivity::GetWindow() {
-  return web_view_->GetWidget()->GetNativeWindow();
+  return web_view_->GetWidget() ? web_view_->GetWidget()->GetNativeWindow()
+                                : nullptr;
 }
 
 content::WebContents* WebActivity::GetWebContents() {
@@ -564,10 +565,6 @@ views::View* WebActivity::GetContentsView() {
   return web_view_;
 }
 
-views::Widget* WebActivity::CreateWidget() {
-  return nullptr;  // Use default widget.
-}
-
 gfx::ImageSkia WebActivity::GetOverviewModeImage() {
   if (content_proxy_.get())
     return content_proxy_->GetContentImage();

athena/content/web_activity.h

@@ -64,7 +64,6 @@ class WebActivity : public Activity,
   gfx::ImageSkia GetIcon() const override;
   bool UsesFrame() const override;
   views::View* GetContentsView() override;
-  views::Widget* CreateWidget() override;
   gfx::ImageSkia GetOverviewModeImage() override;
   void PrepareContentsForOverview() override;
   void ResetContentsView() override;

athena/test/base/sample_activity.cc

@@ -85,10 +85,6 @@ views::View* SampleActivity::GetContentsView() {
   return contents_view_;
 }
 
-views::Widget* SampleActivity::CreateWidget() {
-  return nullptr;
-}
-
 gfx::ImageSkia SampleActivity::GetOverviewModeImage() {
   return gfx::ImageSkia();
 }

athena/test/base/sample_activity.h

@@ -42,7 +42,6 @@ class SampleActivity : public Activity,
   gfx::ImageSkia GetIcon() const override;
   bool UsesFrame() const override;
   views::View* GetContentsView() override;
-  views::Widget* CreateWidget() override;
   gfx::ImageSkia GetOverviewModeImage() override;
   void PrepareContentsForOverview() override;
   void ResetContentsView() override;