Add Finch flag for the WebAPK server URL

chrome/browser/android/webapk/webapk_installer.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/webapk/webapk_installer.h"
 
 #include "base/android/build_info.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/path_utils.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #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"
 #include "base/task_runner_util.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/android/shortcut_helper.h"
 #include "chrome/browser/android/webapk/webapk.pb.h"
 #include "chrome/browser/android/webapk/webapk_icon_hasher.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/manifest_util.h"
 #include "jni/WebApkInstaller_jni.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_fetcher.h"
 #include "ui/gfx/codec/png_codec.h"
 #include "url/gurl.h"
 
 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/";
 
 // The response format type expected from the WebAPK server.
 const char kDefaultWebApkServerUrlResponseType[] = "?alt=proto";
 
 // The MIME type of the POST data sent to the server.
 const char kProtoMimeType[] = "application/x-protobuf";
 
@@ skipping 71 matching lines @@
   return webapk;
 }
 
 // Returns task runner for running background tasks.
 scoped_refptr<base::TaskRunner> GetBackgroundTaskRunner() {
   return content::BrowserThread::GetBlockingPool()
       ->GetTaskRunnerWithShutdownBehavior(
           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.
   return GURL(server_url.spec() + webapk_package + "/" +
               kDefaultWebApkServerUrlResponseType);
 }
 
 // Creates a directory depending on the type of the task, and set permissions.
 // It also creates any parent directory along the path if doesn't exist,
 // and sets permissions as well.
@@ skipping 25 matching lines @@
 
   return output_dir;
 }
 
 }  // anonymous namespace
 
 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();
 }
 
 void WebApkInstaller::CreateJavaRef() {
   JNIEnv* env = base::android::AttachCurrentThread();
   java_ref_.Reset(Java_WebApkInstaller_create(
       env, reinterpret_cast<intptr_t>(this)));
 }
 
 WebApkInstaller::~WebApkInstaller() {
@@ skipping 279 matching lines @@
   std::string webapk_package = webapk_package_;
   delete this;
   callback.Run(true, webapk_package);
 }
 
 void WebApkInstaller::OnFailure() {
   FinishCallback callback = finish_callback_;
   delete this;
   callback.Run(false, "");
 }