update_engine: Move scattering wait period store/load to PayloadState.

This is needed for decoupling the inference/use of this value from its
storing/loading, as we shift the former into the Update Manager.

BUG=chromium:384087
TEST=Unit tests.

Change-Id: I4b278dc817b6f148d5638122f934e9d1e280bfae
Reviewed-on: https://chromium-review.googlesource.com/221250
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Gilad Arnold <garnold@chromium.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/payload_state.h b/payload_state.h
index 99e7d84e..8eb541cd 100644
--- a/payload_state.h
+++ b/payload_state.h
@@ -113,6 +113,12 @@ class PayloadState : public PayloadStateInterface {
     return using_p2p_for_downloading_;
   }
 
+  base::TimeDelta GetScatteringWaitPeriod() override {
+    return scattering_wait_period_;
+  }
+
+  void SetScatteringWaitPeriod(base::TimeDelta wait_period) override;
+
  private:
   enum class AttemptType {
     kUpdate,
@@ -386,6 +392,9 @@ class PayloadState : public PayloadStateInterface {
   // Sets the |kPrefsP2PFirstAttemptTimestamp| state variable to |time|.
   void SetP2PFirstAttemptTimestamp(const base::Time& time);
 
+  // Loads the persisted scattering wallclock-based wait period.
+  void LoadScatteringWaitPeriod();
+
   // The global state of the system.
   SystemState* system_state_;
 
@@ -529,6 +538,9 @@ class PayloadState : public PayloadStateInterface {
   // Whether we're currently rolling back.
   AttemptType attempt_type_;
 
+  // The current scattering wallclock-based wait period.
+  base::TimeDelta scattering_wait_period_;
+
   DISALLOW_COPY_AND_ASSIGN(PayloadState);
 };