Add Finch flag for the WebAPK server URL

chrome/browser/android/webapk/webapk_installer.cc

Index: chrome/browser/android/webapk/webapk_installer.cc
diff --git a/chrome/browser/android/webapk/webapk_installer.cc b/chrome/browser/android/webapk/webapk_installer.cc
index ba03aeafc78163deac95fea00b5de1510f343d9e..24eed04e9777193377edfda332814954de388897 100644
--- a/chrome/browser/android/webapk/webapk_installer.cc
+++ b/chrome/browser/android/webapk/webapk_installer.cc
@@ -13,6 +13,7 @@
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/ref_counted.h"
+#include "base/metrics/field_trial.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ -34,6 +35,9 @@
 
 namespace {
 
+// Flag for setting the WebAPK server URL.
+const char kWebApkServerFinchFlag[] = "WebApkServerUrl";
+
 // The default WebAPK server URL.
 const char kDefaultWebApkServerUrl[] =
     "https://webapk.googleapis.com/v1alpha/webApks/";
@@ -125,6 +129,17 @@ scoped_refptr<base::TaskRunner> GetBackgroundTaskRunner() {
           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 }
 
+GURL GetBaseServerUrl() {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kWebApkServerUrl))
+    return GURL(command_line->GetSwitchValueASCII(switches::kWebApkServerUrl));
+  std::string server_url =
+      base::FieldTrialList::FindFullName(kWebApkServerFinchFlag);
+  if (!server_url.empty())
+    return GURL(server_url);
+  return GURL(kDefaultWebApkServerUrl);
+}
+
 GURL GetServerUrlForUpdate(const GURL& server_url,
                            const std::string& webapk_package) {
   // crbug.com/636552. Simplify the server URL.
@@ -170,15 +185,11 @@ WebApkInstaller::WebApkInstaller(const ShortcutInfo& shortcut_info,
                                  const SkBitmap& shortcut_icon)
     : shortcut_info_(shortcut_info),
       shortcut_icon_(shortcut_icon),
+      server_url_(GetBaseServerUrl()),
       webapk_download_url_timeout_ms_(kWebApkDownloadUrlTimeoutMs),
       download_timeout_ms_(kDownloadTimeoutMs),
       task_type_(UNDEFINED),
       weak_ptr_factory_(this) {
-  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
-  server_url_ =
-      GURL(command_line->HasSwitch(switches::kWebApkServerUrl)
-               ? command_line->GetSwitchValueASCII(switches::kWebApkServerUrl)
-               : kDefaultWebApkServerUrl);
   CreateJavaRef();
 }