capture_mode: Add entry point in power button menu.

Only for tablet mode. Like other capture mode entries, not available for
login/lock/oobe.

Bug: 948120
Test: manual
Change-Id: I37ece1da0a48268507907fed4a713d2c4fb882fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530980
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826114}

ash/capture_mode/capture_mode_metrics.h

@@ -28,7 +28,8 @@ enum class CaptureModeEntryType {
   kAccelTakeWindowScreenshot,
   kQuickSettings,
   kStylusPalette,
-  kMaxValue = kStylusPalette,
+  kPowerMenu,
+  kMaxValue = kPowerMenu,
 };
 
 // Records capture mode bar button presses given by |button_type|.

ash/system/power/power_button_menu_metrics_type.h

@@ -17,7 +17,8 @@ enum class PowerButtonMenuActionType {
   kDismissByTouch,
   kLockScreen,
   kFeedback,
-  kMaxValue = kFeedback,
+  kCaptureMode,
+  kMaxValue = kCaptureMode,
 };
 
 void RecordMenuActionHistogram(PowerButtonMenuActionType type);

ash/system/power/power_button_menu_view.cc

@@ -6,8 +6,10 @@
 
 #include <memory>
 
+#include "ash/capture_mode/capture_mode_controller.h"
 #include "ash/display/screen_orientation_controller.h"
 #include "ash/login/login_screen_controller.h"
+#include "ash/public/cpp/ash_features.h"
 #include "ash/public/cpp/new_window_delegate.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "ash/session/session_controller_impl.h"
@@ -175,6 +177,11 @@ void PowerButtonMenuView::RecreateItems() {
   const bool create_sign_out = login_status != LoginStatus::NOT_LOGGED_IN;
   const bool create_lock_screen = login_status != LoginStatus::LOCKED &&
                                   session_controller->CanLockScreen();
+  const bool capture_mode_enabled = features::IsCaptureModeEnabled();
+  const bool create_capture_mode =
+      capture_mode_enabled &&
+      Shell::Get()->tablet_mode_controller()->InTabletMode() &&
+      !session_controller->IsUserSessionBlocked();
   const bool create_feedback = login_status != LoginStatus::LOCKED &&
                                login_status != LoginStatus::KIOSK_APP;
 
@@ -201,6 +208,16 @@ void PowerButtonMenuView::RecreateItems() {
       kSystemPowerButtonMenuLockScreenIcon,
       l10n_util::GetStringUTF16(IDS_ASH_POWER_BUTTON_MENU_LOCK_SCREEN_BUTTON),
       &lock_screen_item_);
+  add_remove_item(
+      create_capture_mode, PowerButtonMenuActionType::kCaptureMode,
+      capture_mode_enabled
+          ? base::BindRepeating(&CaptureModeController::Start,
+                                base::Unretained(CaptureModeController::Get()),
+                                CaptureModeEntryType::kPowerMenu)
+          : base::DoNothing(),
+      kCaptureModeIcon,
+      l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_CAPTURE_MODE_BUTTON_LABEL),
+      &capture_mode_item_);
   add_remove_item(
       create_feedback, PowerButtonMenuActionType::kFeedback,
       base::BindRepeating(
@@ -251,6 +268,10 @@ void PowerButtonMenuView::Layout() {
       lock_screen_item_->SetBoundsRect(rect);
     }
   }
+  if (capture_mode_item_) {
+    rect.Offset(x_offset, 0);
+    capture_mode_item_->SetBoundsRect(rect);
+  }
   if (feedback_item_) {
     rect.Offset(x_offset, 0);
     feedback_item_->SetBoundsRect(rect);
@@ -272,6 +293,8 @@ gfx::Size PowerButtonMenuView::CalculatePreferredSize() const {
       if (lock_screen_item_)
         width += one_item_x_offset;
   }
+  if (capture_mode_item_)
+    width += one_item_x_offset;
   if (feedback_item_)
     width += one_item_x_offset;
   menu_size.set_width(width);

ash/system/power/power_button_menu_view.h

@@ -88,6 +88,7 @@ class ASH_EXPORT PowerButtonMenuView : public views::View,
   PowerButtonMenuItemView* power_off_item_ = nullptr;
   PowerButtonMenuItemView* sign_out_item_ = nullptr;
   PowerButtonMenuItemView* lock_screen_item_ = nullptr;
+  PowerButtonMenuItemView* capture_mode_item_ = nullptr;
   PowerButtonMenuItemView* feedback_item_ = nullptr;
 
   // The physical display side of power button in landscape primary.

tools/metrics/histograms/enums.xml

@@ -9273,6 +9273,7 @@ Called by update_bad_message_reasons.py.-->
   <int value="1" label="Window Screenshot Accelerator"/>
   <int value="2" label="Quick Settings"/>
   <int value="3" label="Stylus Palette"/>
+  <int value="4" label="Power Menu"/>
 </enum>
 
 <enum name="CapturePixelFormat">
@@ -58672,6 +58673,7 @@ Called by update_net_trust_anchors.py.-->
   <int value="4" label="Touch to dismiss"/>
   <int value="5" label="Lock screen"/>
   <int value="6" label="Feedback"/>
+  <int value="7" label="Capture mode"/>
 </enum>
 
 <enum name="PowerButtonPressType">