Added debugOtaKeyboxFallbackDuration property. am: 8b12e5acc9 am: 90f7296a4e

Original change: https://googleplex-android-review.googlesource.com/c/platform/vendor/widevine/+/16096276

Change-Id: I1e2103a2a3dcfa513be3e6803ebc7b786f846ee2

libwvdrmengine/cdm/core/include/cdm_engine.h

@@ -360,6 +360,16 @@ class CdmEngine {
   virtual void SetUserId(uint32_t user_id) { user_id_ = user_id; }
   virtual uint32_t GetUserId() const { return user_id_; }
 
+  // Changes the rules used for calculating the fallback duration
+  // when OTA keybox provisioning fails.
+  // Default rules use fallback duration measured in days, with exponential
+  // backoff.
+  // Fast rules use fallback durations of a few seconds, without exponential
+  // backoff.
+  // This method has no effect if OTA keybox is not required.
+  virtual void SetDefaultOtaKeyboxFallbackDurationRules();
+  virtual void SetFastOtaKeyboxFallbackDurationRules();
+
  protected:
   friend class CdmEngineFactory;