variations: Support "MEET_DEVICE" form_factor for Finch studies

Create a new form factor for Meeting Room Hardware Workspace Devices,
also known as Chromebox for Meetings, to allow finch support for CfM
specific experiments.

BUG=b:177442621
TEST=ensure unit tests work correctly and test with basic logging to
ensure the correct form factor chosen in chrome.

Change-Id: I89af958017dfb2e68c3e423be7832ef0d7dc8a47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628108
Commit-Queue: Kyle Williams <kdgwill@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Auto-Submit: Kyle Williams <kdgwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844738}

chrome/browser/metrics/variations/chrome_variations_service_client.cc

@@ -11,6 +11,7 @@
 #include "chrome/browser/google/google_brand.h"
 #include "chrome/browser/net/system_network_context_manager.h"
 #include "chrome/common/channel_info.h"
+#include "components/variations/service/variations_service_client.h"
 #include "components/version_info/version_info.h"
 #include "services/network/public/cpp/shared_url_loader_factory.h"
 
@@ -19,7 +20,9 @@
 #endif
 
 #if BUILDFLAG(IS_CHROMEOS_ASH)
+#include "chrome/browser/chromeos/policy/enrollment_requisition_manager.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
+#include "chromeos/components/chromebox_for_meetings/buildflags/buildflags.h"
 #endif
 
 #if defined(OS_WIN) || defined(OS_MAC)
@@ -78,6 +81,20 @@ bool ChromeVariationsServiceClient::OverridesRestrictParameter(
 #endif
 }
 
+variations::Study::FormFactor
+ChromeVariationsServiceClient::GetCurrentFormFactor() {
+#if BUILDFLAG(IS_CHROMEOS_ASH)
+#if BUILDFLAG(PLATFORM_CFM)
+  bool is_meet_device =
+      policy::EnrollmentRequisitionManager::IsRemoraRequisition();
+  if (is_meet_device)
+    return variations::Study::MEET_DEVICE;
+#endif  // BUILDFLAG(PLATFORM_CFM)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
+
+  return variations::VariationsServiceClient::GetCurrentFormFactor();
+}
+
 bool ChromeVariationsServiceClient::IsEnterprise() {
 #if defined(OS_WIN) || defined(OS_MAC)
   return base::IsMachineExternallyManaged();

chrome/browser/metrics/variations/chrome_variations_service_client.h

@@ -28,6 +28,7 @@ class ChromeVariationsServiceClient
   scoped_refptr<network::SharedURLLoaderFactory> GetURLLoaderFactory() override;
   network_time::NetworkTimeTracker* GetNetworkTimeTracker() override;
   bool OverridesRestrictParameter(std::string* parameter) override;
+  variations::Study::FormFactor GetCurrentFormFactor() override;
   bool IsEnterprise() override;
 
  private:

components/variations/field_trial_config/field_trial_util_unittest.cc

@@ -376,8 +376,12 @@ TEST_F(FieldTrialUtilTest,
 TEST_F(FieldTrialUtilTest,
        AssociateParamsFromFieldTrialConfigWithAllFormFactors) {
   const Study::Platform platform = Study::PLATFORM_WINDOWS;
-  const Study::FormFactor form_factors[] =
-      {Study::DESKTOP, Study::PHONE, Study::TABLET};
+  const Study::FormFactor form_factors[] = {
+      Study::DESKTOP,
+      Study::PHONE,
+      Study::TABLET,
+      Study::MEET_DEVICE,
+  };
   const FieldTrialTestingExperimentParams array_kFieldTrialConfig_params[] =
       {{"x", "1"}, {"y", "2"}};
   const FieldTrialTestingExperiment array_kFieldTrialConfig_experiments[] = {
@@ -450,10 +454,13 @@ TEST_F(FieldTrialUtilTest,
   const Study::Platform platform = Study::PLATFORM_WINDOWS;
   const Study::FormFactor current_form_factor =
       variation_service_client_.GetCurrentFormFactor();
-  const Study::FormFactor all_form_factors[] =
-      {Study::DESKTOP, Study::PHONE, Study::TABLET};
-  for (size_t i = 0; i < base::size(all_form_factors); ++i) {
-    const Study::FormFactor form_factor = all_form_factors[i];
+  const Study::FormFactor all_form_factors[] = {
+      Study::DESKTOP,
+      Study::PHONE,
+      Study::TABLET,
+      Study::MEET_DEVICE,
+  };
+  for (const Study::FormFactor form_factor : all_form_factors) {
     if (form_factor == current_form_factor)
       continue;
     const FieldTrialTestingExperimentParams array_kFieldTrialConfig_params[] =

components/variations/proto/study.proto

@@ -244,6 +244,8 @@ message Study {
     TABLET = 2;
     // Chrome OS running in single-app Kiosk mode.
     KIOSK = 3;
+    // Chrome OS running on Meet Hardware devices e.g. Chromebox For Meetings.
+    MEET_DEVICE = 4;
   }
 
   // Enum to pass as optional bool.

components/variations/study_filtering_unittest.cc

@@ -88,9 +88,9 @@ TEST(VariationsStudyFilteringTest, CheckStudyChannel) {
 }
 
 TEST(VariationsStudyFilteringTest, CheckStudyFormFactor) {
-  const Study::FormFactor form_factors[] = {
-      Study::DESKTOP, Study::PHONE, Study::TABLET, Study::KIOSK,
-  };
+  const Study::FormFactor form_factors[] = {Study::DESKTOP, Study::PHONE,
+                                            Study::TABLET, Study::KIOSK,
+                                            Study::MEET_DEVICE};
 
   ASSERT_EQ(Study::FormFactor_ARRAYSIZE,
             static_cast<int>(base::size(form_factors)));