Implement server-suggested update check backoff

chrome/browser/android/webapk/webapk_installer.h

Index: chrome/browser/android/webapk/webapk_installer.h
diff --git a/chrome/browser/android/webapk/webapk_installer.h b/chrome/browser/android/webapk/webapk_installer.h
index bfb925f0d7c94f63eb2d7b84d07cb2affb65d77f..fd7060bc87ebd3f53688ac02462a509be6c6feed 100644
--- a/chrome/browser/android/webapk/webapk_installer.h
+++ b/chrome/browser/android/webapk/webapk_installer.h
@@ -43,7 +43,9 @@ class WebApkInstaller : public net::URLFetcherDelegate {
   // Parameters:
   // - whether the process succeeds.
   // - the package name of the WebAPK.
-  using FinishCallback = base::Callback<void(bool, const std::string&)>;
+  // - true if Chrome received a "don't update so frequently" directive from the
+  //   WebAPK server.

[pkotwicz, 2017/02/14 00:15:13]

Nit: "don't update so frequently" -> "request updates less frequently"

[Xi Han, 2017/02/14 22:25:47]

Done.

+  using FinishCallback = base::Callback<void(bool, const std::string&, bool)>;

[dominickn, 2017/02/14 04:13:34]

Urgh this bool string bool argument ordering is not nice... :)

[Xi Han, 2017/02/14 22:25:47]

Done.

 
   ~WebApkInstaller() override;
 
@@ -270,6 +272,9 @@ class WebApkInstaller : public net::URLFetcherDelegate {
   // WebAPK package name.
   std::string webapk_package_;
 
+  // Whether the server wants the WebAPK to request updates less frequently.
+  bool less_updates_;

[dominickn, 2017/02/14 04:13:34]

relax_updates_

[Xi Han, 2017/02/14 22:25:47]

Done.

+
   // WebAPK version code.
   int webapk_version_;