ios/chrome/browser/experimental_flags.mm

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This file can be empty. Its purpose is to contain the relatively short lived
   6 // definitions required for experimental flags.
   7
   8 #include "ios/chrome/browser/experimental_flags.h"
   9
  10 #include <string>
  11
  12 #include "base/command_line.h"
  13 #include "base/metrics/field_trial.h"
  14 #include "base/strings/string_number_conversions.h"
  15 #include "base/strings/string_util.h"
  16 #include "components/variations/variations_associated_data.h"
  17 #include "ios/chrome/browser/chrome_switches.h"
  18 #include "ios/web/public/web_view_util.h"
  19
  20 namespace {
  21 NSString* const kEnableAlertOnBackgroundUpload =
  22     @"EnableAlertsOnBackgroundUpload";
  23 }  // namespace
  24
  25 namespace experimental_flags {
  26
  27 bool IsAlertOnBackgroundUploadEnabled() {
  28   return [[NSUserDefaults standardUserDefaults]
  29       boolForKey:kEnableAlertOnBackgroundUpload];
  30 }
  31
  32 bool IsWKWebViewEnabled() {
  33   // If WKWebView isn't supported, don't activate the experiment at all. This
  34   // avoids someone being slotted into the WKWebView bucket (and thus reporting
  35   // as WKWebView), but actually running UIWebView.
  36   if (!web::IsWKWebViewSupported())
  37     return false;
  38
  39   std::string group_name =
  40       base::FieldTrialList::FindFullName("IOSUseWKWebView");
  41
  42   // First check if the experimental flag is turned on.
  43   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
  44   if (command_line->HasSwitch(switches::kEnableIOSWKWebView)) {
  45     return true;
  46   } else if (command_line->HasSwitch(switches::kDisableIOSWKWebView)) {
  47     return false;
  48   }
  49
  50   // Check if the finch experiment is turned on.
  51   return StartsWithASCII(group_name, "Enabled", false);
  52 }
  53
  54 size_t MemoryWedgeSizeInMB() {
  55   std::string wedge_size_string;
  56
  57   // Get the size from the Experimental setting.
  58   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
  59   wedge_size_string =
  60       command_line->GetSwitchValueASCII(switches::kIOSMemoryWedgeSize);
  61
  62   // Otherwise, get from a variation param.
  63   if (wedge_size_string.empty()) {
  64     wedge_size_string =
  65         variations::GetVariationParamValue("MemoryWedge", "wedge_size");
  66   }
  67
  68   // Parse the value.
  69   size_t wedge_size_in_mb = 0;
  70   if (base::StringToSizeT(wedge_size_string, &wedge_size_in_mb))
  71     return wedge_size_in_mb;
  72   return 0;
  73 }
  74
  75 }  // namespace experimental_flags