[Tablet Form Factor] Add optional flag

Adds an optional flag for devices with tablet form factor.

BUG=1019549

Change-Id: I24a95d473fa59d9efe582986b6e19330afa75b07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888857Reviewed-by: Yury Khmel <khmel@chromium.org>
Reviewed-by: Jeevan Shikaram <jshikaram@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712046}

chromeos/constants/chromeos_switches.cc

@@ -268,6 +268,9 @@ const char kEnableMarketingOptInScreen[] = "enable-market-opt-in";
 // Enables request of tablet site (via user agent override).
 const char kEnableRequestTabletSite[] = "enable-request-tablet-site";
 
+// Enables tablet form factor.
+const char kEnableTabletFormFactor[] = "enable-tablet-form-factor";
+
 // Enables the touch calibration option in MD settings UI for valid touch
 // displays.
 const char kEnableTouchCalibrationSetting[] =
@@ -572,6 +575,11 @@ bool ShouldSkipOobePostLogin() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(kOobeSkipPostLogin);
 }
 
+bool IsTabletFormFactor() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      kEnableTabletFormFactor);
+}
+
 bool IsGaiaServicesDisabled() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       kDisableGaiaServices);

chromeos/constants/chromeos_switches.h

@@ -104,6 +104,8 @@ COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const char kEnableChromevoxDeveloperOption[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) extern const char kEnableConsumerKiosk[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
+extern const char kEnableTabletFormFactor[];
+COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const char kEnableEncryptionMigration[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const char kEnableExtensionAssetsSharing[];
@@ -243,6 +245,9 @@ bool ShouldTetherHostScansIgnoreWiredConnections();
 // Returns true if we should skip all other OOBE pages after user login.
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) bool ShouldSkipOobePostLogin();
 
+// Returns true if the device is of tablet form factor.
+COMPONENT_EXPORT(CHROMEOS_CONSTANTS) bool IsTabletFormFactor();
+
 // Returns true if GAIA services has been disabled.
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) bool IsGaiaServicesDisabled();