Surface enabling ARC for child accounts in chrome://flags.

This does not enable the whole feature, which also requires being in a
server-side whitelist.

Bug: 836246
Change-Id: I6be61a5a18ba1e102d9dceaf801ecdf24931dd9d
Reviewed-on: https://chromium-review.googlesource.com/1088930Reviewed-by: Yury Khmel <khmel@chromium.org>
Commit-Queue: Bruno Kim Medeiros Cesar <brunokim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564967}

chrome/browser/about_flags.cc

@@ -2749,6 +2749,9 @@ const FeatureEntry kFeatureEntries[] = {
      FEATURE_VALUE_TYPE(features::kEHVInputOnImeMenu)},
 #endif  // OS_CHROMEOS
 #if defined(OS_CHROMEOS)
+    {"arc-available-for-child", flag_descriptions::kArcAvailableForChildName,
+     flag_descriptions::kArcAvailableForChildDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(arc::kAvailableForChildAccountFeature)},
     {"arc-boot-completed-broadcast", flag_descriptions::kArcBootCompleted,
      flag_descriptions::kArcBootCompletedDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(arc::kBootCompletedBroadcastFeature)},

chrome/browser/flag_descriptions.cc

@@ -2690,6 +2690,10 @@ const char kAllowTouchpadThreeFingerClickName[] = "Touchpad three-finger-click";
 const char kAllowTouchpadThreeFingerClickDescription[] =
     "Enables touchpad three-finger-click as middle button.";
 
+const char kArcAvailableForChildName[] = "Allow ARC for child accounts";
+const char kArcAvailableForChildDescription[] =
+    "Allow child accounts to start Android apps.";
+
 const char kArcBootCompleted[] = "Load Android apps automatically";
 const char kArcBootCompletedDescription[] =
     "Allow Android apps to start automatically after signing in.";

chrome/browser/flag_descriptions.h

@@ -1649,6 +1649,9 @@ extern const char kAcceleratedMjpegDecodeDescription[];
 extern const char kAllowTouchpadThreeFingerClickName[];
 extern const char kAllowTouchpadThreeFingerClickDescription[];
 
+extern const char kArcAvailableForChildName[];
+extern const char kArcAvailableForChildDescription[];
+
 extern const char kArcBootCompleted[];
 extern const char kArcBootCompletedDescription[];
 

tools/metrics/histograms/enums.xml

@@ -27749,6 +27749,7 @@ from previous Chrome versions.
   <int value="143725809" label="DownloadProgressInfoBar:enabled"/>
   <int value="147342055" label="ChromeHomeClearUrlOnOpen:disabled"/>
   <int value="147373243" label="enable-deferred-image-decoding"/>
+  <int value="151022756" label="ArcAvailableForChildAccount:disabled"/>
   <int value="151101719" label="HtmlBaseUsernameDetector:enabled"/>
   <int value="157217034" label="enable-tab-for-desktop-share"/>
   <int value="157318016" label="AutomaticTabDiscarding:enabled"/>
@@ -28429,6 +28430,7 @@ from previous Chrome versions.
   <int value="1670161209" label="ClickToOpenPDFPlaceholder:enabled"/>
   <int value="1670799163" label="ChromeHomeShowGoogleGWhenUrlCleared:enabled"/>
   <int value="1673427566" label="ChromeHomeExpandButton:disabled"/>
+  <int value="1679558835" label="ArcAvailableForChildAccount:enabled"/>
   <int value="1689123607" label="enable-app-link"/>
   <int value="1689183477" label="enable-merge-key-char-events"/>
   <int value="1690837904" label="save-previous-document-resources"/>