Add UI for cast system tray integration

- TrayCast is the central injection point for the UI code
- TrayCast itself just delegates between two other views, of which only one is active at a time depending on if the device is currently casting
- ScreenCaptureTrayItem is disabled so it will not be active when the device is casting (otherwise there would be two very similar tray items that have the same functionality but slightly different appearance)

BUG=433140

Review URL: https://codereview.chromium.org/1118613003

Cr-Commit-Position: refs/heads/master@{#330398}

ash/ash.gyp

@@ -278,6 +278,8 @@
       'system/bluetooth/tray_bluetooth.cc',
       'system/bluetooth/tray_bluetooth.h',
       'system/brightness_control_delegate.h',
+      'system/cast/tray_cast.cc',
+      'system/cast/tray_cast.h',
       'system/chromeos/audio/audio_detailed_view.cc',
       'system/chromeos/audio/audio_detailed_view.h',
       'system/chromeos/audio/tray_audio_chromeos.cc',

ash/system/cast/tray_cast.h

+// 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.
+
+#ifndef ASH_SYSTEM_CAST_TRAY_CAST_H_
+#define ASH_SYSTEM_CAST_TRAY_CAST_H_
+
+#include "ash/shell_observer.h"
+#include "ash/system/tray/system_tray_item.h"
+
+namespace ash {
+namespace tray {
+class CastTrayView;
+class CastSelectDefaultView;
+class CastDetailedView;
+class CastDuplexView;
+}  // namespace tray
+
+class CastConfigDelegate;
+
+class TrayCast : public SystemTrayItem, public ShellObserver {
+ public:
+  explicit TrayCast(SystemTray* system_tray);
+  ~TrayCast() override;
+
+ private:
+  bool HasCastExtension();
+
+  // Overridden from SystemTrayItem.
+  views::View* CreateTrayView(user::LoginStatus status) override;
+  views::View* CreateDefaultView(user::LoginStatus status) override;
+  views::View* CreateDetailedView(user::LoginStatus status) override;
+  void DestroyTrayView() override;
+  void DestroyDefaultView() override;
+  void DestroyDetailedView() override;
+  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override;
+
+  // Overridden from ShellObserver.
+  void OnCastingSessionStartedOrStopped(bool started) override;
+
+  // This makes sure that the current view displayed in the tray is the correct
+  // one, depending on if we are currently casting. If we're casting, then a
+  // view with a stop button is displayed; otherwise, a view that links to a
+  // detail view is displayed instead that allows the user to easily begin a
+  // casting session.
+  void UpdatePrimaryView();
+
+  bool is_casting_ = false;
+
+  // Not owned.
+  tray::CastTrayView* tray_ = nullptr;
+  tray::CastDuplexView* default_ = nullptr;
+  tray::CastDetailedView* detailed_ = nullptr;
+  CastConfigDelegate* cast_config_delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayCast);
+};
+
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_CAST_TRAY_CAST_H_

ash/system/chromeos/screen_security/screen_capture_tray_item.cc

@@ -24,11 +24,13 @@ const char kScreenCaptureNotificationId[] = "chrome://screen/capture";
 
 ScreenCaptureTrayItem::ScreenCaptureTrayItem(SystemTray* system_tray)
     : ScreenTrayItem(system_tray) {
+  Shell::GetInstance()->AddShellObserver(this);
   Shell::GetInstance()->system_tray_notifier()->
       AddScreenCaptureObserver(this);
 }
 
 ScreenCaptureTrayItem::~ScreenCaptureTrayItem() {
+  Shell::GetInstance()->RemoveShellObserver(this);
   Shell::GetInstance()->system_tray_notifier()->
       RemoveScreenCaptureObserver(this);
 }
@@ -79,6 +81,17 @@ void ScreenCaptureTrayItem::OnScreenCaptureStart(
     const base::Closure& stop_callback,
     const base::string16& screen_capture_status) {
   screen_capture_status_ = screen_capture_status;
+
+  // We do not want to show the screen capture tray item and the chromecast
+  // casting tray item at the same time. We will hide this tray item.
+  //
+  // This suppression technique is currently dependent on the order
+  // that OnScreenCaptureStart and OnCastingSessionStartedOrStopped
+  // get invoked. OnCastingSessionStartedOrStopped currently gets
+  // called first.
+  if (is_casting_)
+    return;
+
   Start(stop_callback);
 }
 
@@ -89,4 +102,8 @@ void ScreenCaptureTrayItem::OnScreenCaptureStop() {
   Update();
 }
 
+void ScreenCaptureTrayItem::OnCastingSessionStartedOrStopped(bool started) {
+  is_casting_ = started;
+}
+
 }  // namespace ash

ash/system/chromeos/screen_security/screen_capture_tray_item.h

@@ -5,6 +5,7 @@
 #ifndef ASH_SYSTEM_CHROMEOS_SCREEN_CAPTURE_SCREEN_CAPTURE_TRAY_ITEM_H_
 #define ASH_SYSTEM_CHROMEOS_SCREEN_CAPTURE_SCREEN_CAPTURE_TRAY_ITEM_H_
 
+#include "ash/shell_observer.h"
 #include "ash/system/chromeos/screen_security/screen_capture_observer.h"
 #include "ash/system/chromeos/screen_security/screen_tray_item.h"
 
@@ -15,7 +16,8 @@ class View;
 namespace ash {
 
 class ASH_EXPORT ScreenCaptureTrayItem : public ScreenTrayItem,
-                                         public ScreenCaptureObserver {
+                                         public ScreenCaptureObserver,
+                                         public ShellObserver {
  public:
   explicit ScreenCaptureTrayItem(SystemTray* system_tray);
   ~ScreenCaptureTrayItem() override;
@@ -35,7 +37,11 @@ class ASH_EXPORT ScreenCaptureTrayItem : public ScreenTrayItem,
       const base::string16& screen_capture_status) override;
   void OnScreenCaptureStop() override;
 
+  // Overridden from ShellObserver.
+  void OnCastingSessionStartedOrStopped(bool started) override;
+
   base::string16 screen_capture_status_;
+  bool is_casting_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenCaptureTrayItem);
 };

ash/system/tray/system_tray.cc

@@ -11,6 +11,7 @@
 #include "ash/shell_window_ids.h"
 #include "ash/system/audio/tray_audio.h"
 #include "ash/system/bluetooth/tray_bluetooth.h"
+#include "ash/system/cast/tray_cast.h"
 #include "ash/system/date/tray_date.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray_delegate.h"
@@ -181,6 +182,7 @@ void SystemTray::CreateItems(SystemTrayDelegate* delegate) {
   AddTrayItem(new TrayVPN(this));
   AddTrayItem(new TraySms(this));
   AddTrayItem(new TrayBluetooth(this));
+  AddTrayItem(new TrayCast(this));
   AddTrayItem(new TrayDisplay(this));
   screen_capture_tray_item_ = new ScreenCaptureTrayItem(this);
   AddTrayItem(screen_capture_tray_item_);
@@ -203,6 +205,7 @@ void SystemTray::CreateItems(SystemTrayDelegate* delegate) {
 #elif defined(OS_LINUX)
   AddTrayItem(tray_accessibility_);
   AddTrayItem(new TrayBluetooth(this));
+  AddTrayItem(new TrayCast(this));
   AddTrayItem(new TrayUpdate(this));
   AddTrayItem(tray_date_);
 #endif