Add initial support for key rotation through ce cdm interface.

Merge from Widevine repo of http://go/wvgerrit/42941

Bug: 72168544
Test: tested as part of http://go/ag/4674759
Change-Id: I1a2d0f49371e5b3edf1d9dff85b85593f981d1f5

libwvdrmengine/cdm/core/include/policy_engine.h

@@ -17,6 +17,7 @@
 namespace wvcdm {
 
 using video_widevine::LicenseIdentification;
+using video_widevine::WidevinePsshData_EntitledKey;
 
 class Clock;
 class CryptoSession;
@@ -57,12 +58,18 @@ class PolicyEngine {
   // permits playback.
   virtual void SetLicense(const video_widevine::License& license);
 
+  // TODO(jfore): Sublicense uses this to update the keys when they are
+  // changed during key rotation. Drop this method and use SetLicenseKeys
+  // instead.
   virtual void UpdateLicenseKeys(const video_widevine::License& license);
 
+  // Used to update the currently loaded entitled content keys.
+  virtual void SetEntitledLicenseKeys(
+      const std::vector<WidevinePsshData_EntitledKey>& entitled_keys);
+
   // SetLicenseForRelease is used when releasing a license. The keys in this
   // license will be ignored, and any old keys will be expired.
-  virtual void SetLicenseForRelease(
-      const video_widevine::License& license);
+  virtual void SetLicenseForRelease(const video_widevine::License& license);
 
   // Call this on first decrypt to set the start of playback.
   virtual void BeginDecryption(void);
@@ -73,8 +80,7 @@ class PolicyEngine {
   // case an exact copy is not what we want to happen. We also will receive an
   // updated license_start_time from the server. The license will transition to
   // kLicenseStateCanPlay if the license permits playback.
-  virtual void UpdateLicense(
-      const video_widevine::License& license);
+  virtual void UpdateLicense(const video_widevine::License& license);
 
   // Used for notifying the Policy Engine of resolution changes
   virtual void NotifyResolution(uint32_t width, uint32_t height);
@@ -101,8 +107,7 @@ class PolicyEngine {
 
   bool IsLicenseForFuture() { return license_state_ == kLicenseStatePending; }
   bool HasPlaybackStarted(int64_t current_time) {
-    if (playback_start_time_ == 0)
-      return false;
+    if (playback_start_time_ == 0) return false;
 
     const int64_t playback_time = current_time - playback_start_time_;
     return playback_time >= policy_.play_start_grace_period_seconds();
@@ -218,6 +223,6 @@ class PolicyEngine {
   CORE_DISALLOW_COPY_AND_ASSIGN(PolicyEngine);
 };
 
-}  // wvcdm
+}  // namespace wvcdm
 
 #endif  // WVCDM_CORE_POLICY_ENGINE_H_