Control permission bubbles with Finch flag

chrome/browser/ui/website_settings/permission_bubble_manager.cc

Index: chrome/browser/ui/website_settings/permission_bubble_manager.cc
diff --git a/chrome/browser/ui/website_settings/permission_bubble_manager.cc b/chrome/browser/ui/website_settings/permission_bubble_manager.cc
index 4a64dae46e13957d0ae08ca686879b4213d6a598..b8d26d5a1882a3d93349eac362d03aef1586da36 100644
--- a/chrome/browser/ui/website_settings/permission_bubble_manager.cc
+++ b/chrome/browser/ui/website_settings/permission_bubble_manager.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/ui/website_settings/permission_bubble_manager.h"
 
 #include "base/command_line.h"
+#include "base/metrics/field_trial.h"
 #include "base/metrics/user_metrics_action.h"
 #include "chrome/browser/ui/website_settings/permission_bubble_request.h"
 #include "chrome/common/chrome_switches.h"
@@ -14,6 +15,11 @@
 
 namespace {
 
+// String constants to control whether bubbles are enabled by default.
+const char kTrialName[] = "PermissionBubbleRollout";
+const char kEnabled[] = "Enabled";
+const char kDisabled[] = "Disabled";
+
 class CancelledRequest : public PermissionBubbleRequest {
  public:
   explicit CancelledRequest(PermissionBubbleRequest* cancelled)
@@ -53,14 +59,20 @@ DEFINE_WEB_CONTENTS_USER_DATA_KEY(PermissionBubbleManager);
 
 // static
 bool PermissionBubbleManager::Enabled() {
+  // Command line flags take precedence.
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnablePermissionsBubbles))
     return true;
-
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisablePermissionsBubbles))
     return false;
 
+  std::string group(base::FieldTrialList::FindFullName(kTrialName));
+  if (group == kEnabled)
+    return true;
+  if (group == kDisabled)
+    return false;
+
   return false;
 }