[desktopCapture] Add red recording dot on the caller tab

This cl is to add a red recording dot indicator for the tab that starts
the desktop capture.
This is part of the required UI change for the new getDisplayMaid API.

Bug: 859981
Change-Id: I9e36f6a4c61802152936282ba5f3902db1f774cd
Reviewed-on: https://chromium-review.googlesource.com/1125079
Commit-Queue: Weiyong Yao <braveyao@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573846}

chrome/app/generated_resources.grd

@@ -8568,6 +8568,9 @@ Please help our engineers fix this problem. Tell us what happened right before y
       <message name="IDS_TOOLTIP_TAB_ALERT_STATE_PIP_PLAYING" desc="Extra tool tip text, when tab is playing a video in Picture-in-Picture.">
         This tab is playing a video in Picture-in-Picture.
       </message>
+      <message name="IDS_TOOLTIP_TAB_ALERT_STATE_DESKTOP_CAPTURING" desc="Extra tool tip text, when the tab is caturing desktop contents.">
+        This tab is sharing your desktop content.
+      </message>
 
       <!-- Tab accessibility labels -->
       <message name="IDS_TAB_AX_LABEL_MEDIA_RECORDING_FORMAT" desc="Accessibility label text, when the tab is recording media. Example: 'Google Hangouts - Camera or microphone recording'">
@@ -8597,6 +8600,9 @@ Please help our engineers fix this problem. Tell us what happened right before y
       <message name="IDS_TAB_AX_LABEL_CRASHED_FORMAT" desc="Accessibility label text, when a tab has crashed. Example: 'Google Search - Crashed'">
         <ph name="WINDOW_TITLE">$1<ex>Google Search</ex></ph> - Crashed
       </message>
+      <message name="IDS_TAB_AX_LABEL_DESKTOP_CAPTURING_FORMAT" desc="Accessibility label text, when the tab is capturing and sharing desktop content using screen sharing. Example: 'Google Hangouts - Desktop content shared'">
+        <ph name="WINDOW_TITLE">$1<ex>Google Hangouts</ex></ph> - Desktop content shared
+      </message>
 
       <!-- ProcessSingleton -->
       <message name="IDS_PROFILE_IN_USE_LINUX_QUIT" desc="Text of button in profile in use dialog to quit without doing anything.">

chrome/browser/ui/tabs/tab_utils.cc

@@ -162,6 +162,12 @@ TabAlertState GetTabAlertStateForContents(content::WebContents* contents) {
       MediaCaptureDevicesDispatcher::GetInstance()->
           GetMediaStreamCaptureIndicator();
   if (indicator.get()) {
+    // Currently we only show the icon and tooltip of the highest-priority
+    // alert on a tab.
+    // TODO(crbug.com/861961): To show the icon of the highest-priority alert
+    // with tooltip that notes all the states in play.
+    if (indicator->IsCapturingDesktop(contents))
+      return TabAlertState::DESKTOP_CAPTURING;
     if (indicator->IsBeingMirrored(contents))
       return TabAlertState::TAB_CAPTURING;
     if (indicator->IsCapturingUserMedia(contents))
@@ -209,6 +215,7 @@ gfx::Image GetTabAlertIndicatorImage(TabAlertState alert_state,
                                    : &kTabAudioMutingIcon;
       break;
     case TabAlertState::MEDIA_RECORDING:
+    case TabAlertState::DESKTOP_CAPTURING:
       icon = &kTabMediaRecordingIcon;
       break;
     case TabAlertState::TAB_CAPTURING:
@@ -249,6 +256,7 @@ gfx::Image GetTabAlertIndicatorAffordanceImage(TabAlertState alert_state,
     case TabAlertState::BLUETOOTH_CONNECTED:
     case TabAlertState::USB_CONNECTED:
     case TabAlertState::PIP_PLAYING:
+    case TabAlertState::DESKTOP_CAPTURING:
       return GetTabAlertIndicatorImage(alert_state, button_color);
   }
   NOTREACHED();
@@ -258,7 +266,8 @@ gfx::Image GetTabAlertIndicatorAffordanceImage(TabAlertState alert_state,
 std::unique_ptr<gfx::Animation> CreateTabAlertIndicatorFadeAnimation(
     TabAlertState alert_state) {
   if (alert_state == TabAlertState::MEDIA_RECORDING ||
-      alert_state == TabAlertState::TAB_CAPTURING) {
+      alert_state == TabAlertState::TAB_CAPTURING ||
+      alert_state == TabAlertState::DESKTOP_CAPTURING) {
     return TabRecordingIndicatorAnimation::Create();
   }
 
@@ -314,6 +323,10 @@ base::string16 AssembleTabTooltipText(const base::string16& title,
       result.append(
           l10n_util::GetStringUTF16(IDS_TOOLTIP_TAB_ALERT_STATE_PIP_PLAYING));
       break;
+    case TabAlertState::DESKTOP_CAPTURING:
+      result.append(l10n_util::GetStringUTF16(
+          IDS_TOOLTIP_TAB_ALERT_STATE_DESKTOP_CAPTURING));
+      break;
     case TabAlertState::NONE:
       NOTREACHED();
       break;
@@ -358,6 +371,10 @@ base::string16 AssembleTabAccessibilityLabel(const base::string16& title,
     case TabAlertState::PIP_PLAYING:
       return l10n_util::GetStringFUTF16(IDS_TAB_AX_LABEL_PIP_PLAYING_FORMAT,
                                         title);
+
+    case TabAlertState::DESKTOP_CAPTURING:
+      return l10n_util::GetStringFUTF16(
+          IDS_TAB_AX_LABEL_DESKTOP_CAPTURING_FORMAT, title);
     case TabAlertState::NONE:
       return title;
   }
@@ -382,6 +399,7 @@ bool CanToggleAudioMute(content::WebContents* contents) {
     case TabAlertState::TAB_CAPTURING:
     case TabAlertState::BLUETOOTH_CONNECTED:
     case TabAlertState::USB_CONNECTED:
+    case TabAlertState::DESKTOP_CAPTURING:
       // The new Audio Service implements muting separately from the tab audio
       // capture infrastructure; so the mute state can be toggled independently
       // at all times.

chrome/browser/ui/tabs/tab_utils.h

@@ -35,6 +35,7 @@ enum class TabAlertState {
   BLUETOOTH_CONNECTED,  // Tab is connected to a BT Device.
   USB_CONNECTED,        // Tab is connected to a USB device.
   PIP_PLAYING,          // Tab contains a video in Picture-in-Picture mode.
+  DESKTOP_CAPTURING,    // Desktop contents being recorded, consumed by tab.
 };
 
 enum class TabMutedReason {

chrome/browser/ui/views/tabs/tab.cc

@@ -958,6 +958,7 @@ SkColor Tab::GetAlertIndicatorColor(TabAlertState state) const {
                                       ThemeProperties::COLOR_TAB_ALERT_AUDIO)
                                 : button_color_;
     case TabAlertState::MEDIA_RECORDING:
+    case TabAlertState::DESKTOP_CAPTURING:
       return theme_provider->GetColor(
           ThemeProperties::COLOR_TAB_ALERT_RECORDING);
     case TabAlertState::TAB_CAPTURING: